Believe it or not, the day after Thanksgiving is one of the busiest days of the year for plumbers. 

“The No. 1 reason people call is because of clogged drains,” says Mike Donley of Phoenix-based Donley Service Center. “People pour things down they shouldn’t, and cram too much into the garbage disposal.”

To head off a plumbing emergency, Donley says you need to be careful about what you put down your disposal. Do not treat it like a trash can. That in mind, here are eight things that should never go in your garbage disposal and three tips to help keep it running as well.