Multiple Rubber Duck Disorder (MRDD) where I can’t just have one. The Multiple Rubber Duck Disorder: When Your Collection Becomes a Disorder Okay, let’s be honest, who doesn’t love a good rubber duck? Those cheerful little bathtime buddies have brought joy to generations. But what happens when your affection for these squeaky companions crosses the line from “adorable hobby” to “full-blown obsession”? Enter: Multiple Rubber Duck Disorder (MRDD).