Three years ago I applied for my student driver's permit, and to prepare myself for the practical tests I practiced parking at a local park's parking lot using my uncle's old Toyota (a 1995 Camry).
While attempting to park next to a black Benz, I miscalculated my distance and I badly gashed the left front door of that Benz. I panicked for a moment there, since if the owner saw me in that situation, and I don't know who owns it, I can be in a world of financial hurt.
I looked around to check if anyone saw me. Luckily the park had no cameras back then, so I immediately sped home and hid uncle's car in another relative's garage for the meanwhile. I returned to the park an hour later to find the owner going around nearby the parking lot asking bystanders if anyone saw the "bastard" who dented his Benz, and he looked really angry.