For a bike you couldn't even claim someone tipped it over (by hand) as an act of vandalism because "tips over" is part of collision coverage. Which is stupid. Guess I should've read that closer.
Unless there is malicious intent. If my bike was tipped I'd be sure to uhhhhh 'witness' someone tip it and flee the scene. If they tried to tell you that THAT is a collision I would tell them that the proximate cause was the unknown vandals attack on the bike and it's there for a clear cut vandalism comp claim.