Back in Switzerland, I played on a team that went on a late-season road trip. April Fool's Day was coming around, so we decided to pull a little prank on the rookies while we were in the hotel. While they were asleep, we took a plastic cover and loosely taped it to the door frame of their bedrooms around the edges, so that it wouldn't slip out but so that there was a space between the bag and the door. Next, we took a bunch of balloons, inflated them, and put them between the cover and the door. When the rookies got up in the morning and tried to go down to breakfast, they'd open their hotel room door and be greeted by a storm of balloons straight to the face and get tangled up in the cover. It's a ton of fun, and I've been told that at least a few of the rookies have used the same trick in later years.