I used to watch this super weird move a lot as a kid but I don't remember the name. There's a kid playing and he gets dirty so his mom makes him take a bath. And then as he's playing in it he shrinks in size to the point of becoming microscopic and then enters his bath sponge, meeting a race of microscopic sponge-like creatures inside it.
This one movies where its a bunch of alien gremelin lookin thingies no bigger than a rat that killed a little girl in the bathtub then when her mom came lookin for her the said" [daughter's name] is gone now" and attacked the mom offscreen. Ive tried lookinf for the movie but only got this movie called critters. Oh also this other movie where a gin...... reply