On the whammy pedals i've tried, when you play chords and then bend it up an octave or two, it make this weird computer-ish noise that kinda reminds me of The Matrix... But god, they're fun..
I found it highly amusing murdering Santana's 'Europa' by bending the absolute shite out of the last note of each phrase. Not so amusing for anyone who happened to be listening, but hey, who cares :D