Buy side/sell side joke

Passed on to me by a friend on the buy-side (if an investment banker ever asks you to tell him a joke in the job interview, this may a a great one for him ).

“What is the difference between a buy-side and a sell-side trader?”
“One says “f*** you” and hangs up the phone – the other hangs up the phone and then says “f*** u”

hehehe.