Written Option 1:

Oliver Castillon is a huge proponent of the idea that pranks should not be hurtful to anyone in any way. In general, he's not really one to pull pranks anyway and greatly prefers good-natured ribbing or running in-jokes.
That said, many seasons ago, one of the games was supposed to have Panthers rubber ducks as a promotion a item. For imagery, it was a rust orange panther wearing the teal home jersey and aviator sunglasses, and then crammed into the shape of a rubber duck. They also wail more like rubber chickens when pressed instead of a small squeak. Well, unfortunately, the game was cancelled due to a power outage and the ducks were forgotten until Oliver found them and made a pranking game out of distributing them to his teammates, coaches, and training staff. For weeks, anyone was liable to find or be passed a duck at any time. He even somehow managed to get in and out of the GM's office to put a duck in his chair.
A few seasons down the line, it's now a rite of passage to get "Duckied". After the first few, every encounter has been different, and he's even taken to learning magic tricks and sleight of hand.