Oh my god, I just had John Valby flashbacks. That guy was insane! He would sing Hey La dee, hey la dee, hey la dee dah..... the audience would yell names and he would improvise raunchy lyrics.

Something like this:
“I know a girl her name is Margie..... oh fuck what rhymes with Margie?
I know a girl her name is Margie her cu__ is so big she can fck a large tree.”

We would get drunk and fall about the floor laughing hysterically.