Quote from Robin in The Rough Patch
[flashback to Barney's apartment:] Robin: Isn't it time you got rid of your stupid doll? Barney: It's not a doll. It's a Stormtrooper. Robin: Uh... He's wearing a diaper. Barney: It's not a diaper, Robin. It's protective armor. Robin: Stormtrooper, more like Stormpooper. Barney: Stop it! Robin: Whoa! Oh! It sounds like your Stormpooper here needs a changing.