In my local sorority's new member ceremony, there was a point where the new members have to say something in unison. One of my pledge sisters wasn't quite paying attention, so when we got to that part, the rest of us spoke but she didn't say anything. The initiated sisters noticed, stopped the ceremony, and waited for her to realize that she was supposed to say something... she was so embarrassed...
One year at pref, we had set up a balloon arch consisting of a string of helium balloons tacked down at 4 points, so it looked something like: (I hope this comes out well)
Code:
o-o o-o-o o-o
/ \/ \/ \
We were in the middle of a very quiet part of the ceremony when one of the central points came loose - SNAP! followed by the thud of several balloons hitting the ceiling. A few minutes later, during a sister's speech, the other one went. Luckily all the balloons stayed attached to the string, and the two outer points stayed anchored... otherwise we'd have had to find a way to get several dozen balloons out of a waffle ceiling...!