Some Dude Syndrome
The classic syndrome exhibited by those who got beat up, stabbed or shot, and dont want to admit they know who did it. usually by some wrong-doing over drugs or money owed.
dr smith: do you know what happened tonite?

Billy Bob: YA! i was standing on my porch, minding my own business, smoking a cigarette, and "some dude" came along and shot me!

dr smith: did you see this person?

billy bob: nope. it was just some dude.

i.e. some dude syndrome