One of our former cats used to like to explore the toilet bowl when we'd inadvertently leave the lid up......until one day.........when he slipped......and took a swim! Never saw him move so fast, flinging water all over the house while he was racing away! That was his last attempt at trying to get a drink out of THERE! And he must've spread the word to the other cats in the house - they never tried it after that!
Bill