What's the one item every junk drawer must have to be classified a junk drawer?

Today I realized I had to many junk drawers in my house. One in the kitchen, bedroom, livingroom and laundry room. So I started cleaning them out in hopes to consolidate down to 2. (Kitchen and Livingroom) The one thing I noticed that was in all of them were questionable batteries ones I don't know if they are dead, half or new. That got me wondering what everyone else would consider a staple/must have in their junk drawers.