Number One sign that you need to restate and reinforce the rule that nobody can bring a toy to the potty when they go to do their business:
When you hear someone yell from the downstairs bathroom, "Keeeeeeeeeeeeefah (that is what how Kevin says Keith's name), Keeeeeeeeeeeeeeefah, DONT FLUSH IT YET!!!!!!" and you run downstairs to find the car pictured above in the bottom of the toilet bowl with a certain child still doing his business on the potty.
Hence, there is a need for said car to have a spin in the dishwasher on the hottest cycle. (believe me, I would've just thrown it away. but NO. It HAD to be a Cars 2 vehicle.)