This week, The Big Bang Theory focused on a love experiment and the hassle of airports losing luggage, which could only be made worse when said luggage contains ashes.

Penny and Sheldon decide to partake in a love experiment to see if answering intimate questions and looking into each other’s eyes can make you fall in love with someone in a matter of hours. They both are sure neither will fall for the other, but they do share some sweet and revealing moments to one another.

While their significant others are doing the experiment, Leonard and Amy go on an outing with Raj and Emily. Emily suggests they go to what is known as an ‘Escape Room,’ where they solve puzzles in order to get out of a locked room. It’s a fun time for them, especially with an actual zombie present.

Meanwhile, Howard and Bernadette are stuck at the airport when his luggage goes missing, which includes his mother’s ashes. He is hurt and upset, and then he reveals to his wife his feelings of guilt for not doing something for his mother that she had asked.

This was an amazing episode of the show and brought two characters together in a close relationship while also revealing the sadness Howard is still going through after losing his mom. Here are our top moments from “The Intimacy Acceleration.”

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10. Experiment

Sheldon talks about an experiment where you can make someone fall in love by only answering a few questions. After talking it over with everyone, Penny asks Leonard if she can try out the experiment with Sheldon and assures them she won’t fall in love with him.

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9. Lost mother

Howard and Bernadette are in the airport where they find out they have misrouted the luggage containing his mother’s ashes. He ends up blurting out that she was the “only woman who ever loved me” before correcting himself to reflect she was the first one, much to Bernadette’s calm, yet subtle annoyance.

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8. Double date

To give themselves something to do, Leonard and Amy go on a double date with Raj and Emily. They decide to go to an interactive theater type date where they solve puzzles in order to escape a locked room. The scene below shows them before the date when Raj is worried about the love experiment.

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7. No mention

Penny and Sheldon are answering questions and one involves their perfect day. Neither of them makes mention of either Leonard or Amy being there, so they clarify that, for Penny’s ideal day at the beach, Leonard has a book and Amy made Sheldon breakfast.

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6. Intelligence

Penny and Sheldon’s exercise causes them to reveal some things that they normally wouldn’t. For Penny, she wishes she could be as smart as the others and Sheldon wishes he could read people’s minds so he’d know whether people were joking or laughing at him since he never knows for sure.

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5. Too busy

Howard and Bernadette share a moment when he tells her that his mom wanted him to drive him to the airport for Florida, but he had too much going on. The tender moment makes Bernadette get up and demand that the airport employee find his mother.

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4. Early finish

The double date ends quickly since the teams are able to use their smarts to find the key to get out of the locked room. The zombie in the room tries to get them to avoid finishing early and when they are about to leave after talking about having fun, he tells them to make sure they remember before making an online review.

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3. Pisces

Penny finds out that it is Sheldon’s birthday, which he has never revealed to any of his friends because he doesn't like surprise parties. He tells her he only told her because they had to be honest for the experiment. The scene below shows Penny and Sheldon during the final part of the experiment.

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2. The urn

The bag containing Howard’s mom’s ashes are returned and after seeing her husband talk to the urn, Bernadette groans that it will end up in their bedroom.

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1. Surprise

After the experiment is over, Penny walks Sheldon to his apartment after they go to a convention he was looking forward to. Then, he gets the shock of his life seeing their friends yell “Surprise” with the room full of balloons.

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