Toothbrushes, TV remotes, your fingers, computer mice, wooden spoons (the handle part), that pole that holds up the kitchen paper roll, the handle of a screwdriver, the handle of an adjustable wrench, etc.
a toothbrush is obviously not thick enough
which of these would you recommend the most?
I think he means an electric (vibrating) toothbrush.
A wine/champagne bottle, for those who like extreme sports.
computer mice