What are some of your most frugal habits?

For example, these are some of mine:

-> I re-use dryer sheets (if I use them at all) for a couple of loads.
-> I buy generic at the grocery store almost all of the time (much to my husband’s dismay…)
-> I use cold water only, in the washing machine.
->I never buy books, I just go to the library!

Thanks for reading!