My two love throwing toys into their water bowls. I have learned to only put plastic toys near their water bowls because it happens almost daily, especially if they know I just cleaned the bowls
We have four rabbits (three water bowls total) and I fish at least one hard plastic baby key-ring, stackable plastic cup (the toddler toy kind), wiffle ball and/or hard plastic baby link out of one of their water bowls on pretty much a daily basis, lol. For some reason, some bunns are obsessed with putting things in their water. I had to swap the softball size wiffle balls for baseball sized ones because Alice kept putting hers in the water bowl - I'd always ask her "What are you going to do when you get thirsty, genius?" because the larger size took up so much space in the bowl that there was no room left to drink .