Tools. Usually on top of a step ladder. It happens when I’m working on a project and I have to get down for some reason. I think, “I’ll just leave this [hammer, screwdriver, drill, etc.] up here for a second. I’ll totally remember it’s there.”
To the surprise of no one here, I do not remember. Until I go to move the ladder and get clobbered with said tool. I’ve gotten a lot better at just taking everything down with me. 🤷♂️
I’ve had a Phillips Sonicare for years with no complaints.