overheard in park slope

1. who's that on your shirt?

2. oh, philip glass... you know, the composer..?

1. oh yeah! i know a great philip glass joke.

2. you have to tell it to me!!!

1. okay: knock knock...

2. who's there?

1. knock knock...

2. who's there...?

1. knock knock!

2. ... who's there?

1. PHILIP GLASS!!!

2. HA! i love it!!!!