I unplugged my computer charger from a multi-plug extension cord with many empty sockets and the wires were still tangled on the floor so I pulled on the charger to get it loose, but I accidentally dropped it onto the cord. Suddenly there was a small bright spark when the plug hit the cord and it tripped a breaker and the lights went out. The extension cord is type F and looks like this one.
Everything still works fine, but I wonder what exactly happened that made the breaker trip. Any ideas? I would guess that the plug fell into the socket at an angle or something, but I don't know if that would make it trip. It could've also been the other end of the computer charger, but it's much wider than the plug pins for example.