Seeing/Hearing other players playing YOUR basslines...?
In the course of being a working musician this will happen from time to time. It's happened to me 3 times in the last few months...I do a record with someone but I'm unavailable for their gigs due to scheduling conflicts. Somehow though I end up seeing them live or on a web video, someone playing my basslines. Kinda weird/cool I guess, but also funny when they don't quite nail it.