I always yell out something when I see people with Led Zeppelin shirts on, don't think I've ever been ignored though, that sucks.
On Ron White's Comedy Central special last night (4/19) he had a joke,
"The first person to ever utter the phrase, "Shake for my girl, I wanna be your back door man" was actually Richard Milhous Nixon. A lot of people probably think it was Led Zeppelin, but no. I'm 90% sure. Well actually 77% sure. Make that 51% sure. Ok, it was Led Zeppelin"
I laughed my ass off for several minutes!