Ok here goes:
A symphony is playing Beethoven's Ninth Symphony. Unfortunately, the string bass part on that piece has a really long stretch or rest. On day the bassists are shooting the shit during rehearsal, and one of them says "If we leave at the start of the rest, we can probably get a beer next door and get back in time to play."
The other says "I don't think we could quite make it, but I've got an idea. Maybe we can buy a little time if we tie some pages of the conductors music together. That way while he's fiddling with the knots we can get back."
So the basses went out, and one drink turned into two, and they only made it back right as the conductor got to the tied together pages. And the orchestra was really in trouble, because it was the bottom of the ninth, the basses were loaded, and the score was tied!