The whiny original poster kept the knife because he was heartbroken about the game and wanted a nice knife, with an excuse to keep it. He thought keeping the knife would hurt the feelings of the fan of a team that just destroyed his gold-number-wearing Bulldogs. But mainly he was a neck who exploited his mother in law who wasn't hurt as an excuse to keep a knife.
If someone dropped a cowbell on me I'd let it stay on the ground. I wouldn't steal it. He could come get it if he wanted it back. I wouldn't call the cops about an accident. Only a baby would do that.
Also, the scenario would never happen. I don't go to Davis-Wade.