u/Banana-9

Besides eating certain things, how can I really clog a toilet? Due to certain incidents at my workplace (such as being fired with no reason, communication, or severance pay), I would like to leave them a nice little going away gift. Not something that will cause permanent, irreversible damage please. I have some backup plans too, but I need something as a cherry (dookie) on top.

Edit: I know the person responsible for firing me is the same person responsible for cleaning the toilets at the end of the day. We don't have a janitor. Also, thanks for the overwhelming amount of replies. I'll likely do some sort of something wrapped in toilet paper, and I was thinking about leaving a piece of dead fish in the tank for the spicy aroma.