What are the fun little things that made you laugh while being intimate and made you feel more comfortable?

So, imagine being a third or a couple with another couple and you’re past the talking stage and things are getting hot. What are the things that the other person did that made you all laugh and had a good bonding moment over? Like maybe someone wore a funny print underwear on purpose, burped out of nowhere, etc? If not, what is something that you’d like someone to do to make you feel comfortable and connected or even laugh about in the middle of the scene?