I have one cat that will go into his litter box and pee when I do!
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Yes, that sounds familiar. I am careful when closing the bathroom door because Frederica is always first in there and Koko is usually caught in his rear end when rushing to get in before the door shuts, so I finally gave up that little ritual of locking the door since I live alone. He will hurl himself against the door, then I usually hear a scratching noise and a thump where he's tried to turn the door handle, claws slide off and he drops to the ground, then there's the little paws under the door and whining. He's half Siamese but does not have that big voice they usually have, thank goodness!!!
Then they each beg and shake hands for their individual treats which I keep in there for them, and then Freddy will go to her big box potty when told to, even when she doesn't have to go, but will jump in, scratch around and then jump out. Much easier than actual disobedience.