When I was in High School, after coming out of my shell, people knew who I was, always asking "Arent you in that band ____". Yes, I was, but that band consisted of myself on vocals and my friend on guitar. We never completed our lineup before moving on. Shortly after I took up the bass.
Ive also had this idea to form a fake band, make a facebook page, get some other people on board, and post actively on the fb as if we just played the most awesome show the night before (of course, we'd never advertise the gigs beforehand). A form of social experiment, if you will.