I mix water with the milk to make it go further when we are running low.
I don't flush the toilet every time I pee to save on the water bill.
I buy gifts for my kids from the goodwill or other thrift shops if I can.
I re-use coffee grounds. DH likes his really strong, and we have a one cup coffee maker, so I make his first then re-use the grounds to make mine.
I save dryer lint. I really have no reason for that. I just can't make myself throw it away. Lol!
I save old sheets and make house dresses, nightgowns and aprons. They're usually ugly, but it works.
There are other things, but I can't think of them right now.
Do you do silly things because you're cheap or money is tight?