A toilet. Didn't buy but accumulated on the walk home, from where I don't know.
Put it in a mate's lounge, was used as a seat until the wee hours. In the morning my mate's Dad woke up, assumed the toilet was theirs and told my mate to reinstall the toilet back in the bathroom, he wasn't going to ask any questions as to why it was in the lounge. Just said he needed a dump, and to get on with it sharpish.