Son of the Mask, easily.
ETA: Here’s the thing, guys- remember the showstopping “Cuban Pete” scene in the first movie? How it stands out as the film’s high point and is very impressive even out of context? That’s a Ricky Ricardo song. There are no (as-)direct other references to Ricardo in the rest of the film. I did not know this as a small child. You do not need to know this to enjoy the scene.
Son of the Mask goes ahead and shows us the entire Michigan J. Frogbit because despite having that scene in its forerunner, it doesn’t respect its own audience enough to assume that they’d “get” a reference to the second most-iconic WB character of all time. This movie is so dumb it assumes that you’re dumb, too. What a timesuck.
BF and I have a March Madness-style bracket of the worst movies we’ve seen together… this is next-level. It beat The Emoji Movie. It beat Spy Kids 3D. We’re putting off watching Suicide Squad because we’re pretty sure it’ll beat that, too.