hair tie - A hair tie is a magical item that disappears when you need i

A hair tie is a magical item that disappears when you need it most and shows up when you’re wearing a hat and don’t need it.

I looked for my hair tie for 10 minutes and found it in my sock drawer.

My hair tie went missing during lunch and came back during recess.

I had 4 hair ties and lost them all in 1 day.