What's the craziest thing you've done to not waste something?

A friend of mine found a pizza that was probably around 2 weeks old in her fridge. It was covered in mold and was seriously dripping, there was like a puddle of pizza sauce and cheese on the bottom of the fridge. She said she was about to throw it away but decided not to waste it so she flushed it... and now her disposal is clogged.