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When drummers get too comfortable bashing a rubber pad and then realize they can't hit a real drum without looking like a clueless idiot. It's like showing off your fancy moves on a treadmill and then trying to run a marathon.
I tried to do my sick fill on the actual drum and it sounded like my dog kicked the cymbal.
My buddy showed off his pad skills at the show and got roasted by the entire audience.
I practiced on my pad for weeks and then tried to play live and it was like I'd never touched a drum before.