A common trope in sitcoms and movies is the unexpected round-of-applause from a group of people after a momentous occurence. In romantic comedies it's usually a group of people in a restaurant after a public proposal or confession of love. In real life, people aren't usually compelled to randomly applaud (outside of traditional situations like a performance or speech). But when it does happen, it's pretty memorable.
1.) From b_wald81:
I was driving some friends home from a christmas party when we hit some black ice, sending the car careening sideways down a 180o offramp. I saved it, and got the damned thing stopped, pointing in the right direction and in our lane, by the time we got to the bottom of the ramp.
There was no clapping, but there was cheering.
2.) From aveave5: