One time after an away soccer game, I found the team jacket an opposing player had left behind. I wore it around, showing off to my teammates like I was a hunter and I'd shot a rhinoceros.
Next time we played that school, one of my teammates dared me to get another trophy. After the game was over I snuck into the opposing team's locker room, like I had to use the bathroom. Then I looked around in the open lockers, found a team sweatshirt and snagged it. Score! Then I ran back to the bus all adrenalinized. We giggled like maniacs in the back seat.