Game of “Spot the Toilet”

One would think there'd be loads of examples of potty humor on MAD Magazine covers.
Turns out only five have been dumped on us.

Sitcom SpecialSpecial #89 Howard Plunged#339 Super Bowl#390 Alfred Stalled#485 Game of Thrones#521

Does the cover of #397 count in this case? Yes…
If you believe a taco shell is actually a portable toilet.