I practiced my late night TV standup routine audition piece at the funeral because I thought we needed a good laugh.
That does not seem like the smartest idea. Do you have another reason for practicing?
There is a reason, but it's a bad one.
Funerals are tragic events and you shouldn't perform at them. You will make everybody upset and it will cause problems.
It's not that bad. I was just joking around and if those people don't get it then they are not my friends anyway.
Even friends can think that you were being inappropriate to perform at a funeral. It will make them feel even worse that somebody try to take over and change the mood of the event.