At a high school football game last night, I was in the men's room taking a leak just before the start of the third quarter, when I heard this conversation going on behind me:
"Is it heavy?"
"No, you kind of get used to it."
"How hard do you have to blow?"
"Not very hard if you practice a lot."

I was enormously relieved when I turned around and saw one of the kids was in a marching band uniform, and the other one wasn't.