I heard this from my senior teammate. He bowled with a guy back in the day who would take few steps back on the approach then go forward...
The weirdest thing I've seen was bowling with this guy who uses a mouth piece.
Ha, ha! Didn't you know bowling was a contact sport!!??
Yeah, I too know a lady who bowls and reverses herself! She gets on the approach, pauses, then takes, like two or three steps forward as if to deliver the ball, pauses again, backs up two or three steps and then goes forward again to deliver the ball. Whenever she gets up to bowl. I go walk away and do something else. It's nerve wracking to watch and its gotta mess with people who have never seen her bowl before! (an inverted wind-up)
Older guy I used to watch bowl, would bowl with a stutter step. He would take a step, stop, take a step, stop,take two steps, stop, and then go ahead and follow throught with the rest of his delivery. First time I ever saw this, I just dropped my ball in the return and disgustedly went back to my seat! Once he had taken his first step, I thought he had moved on to deliver the ball. Imagine my surprise to look up and realize he had not yet completed his "Bowling Tango"! (or maybe it was the Cupid Shuffle)