Jelly telly

Programmes that require minimal brain power to enjoy. Invaluable when whacked after a long week - eg, Inspector Morse repeats

Sighns

Toilet door signs with ambiguous graphics to deliberately blur the
distinction between the men's and women's.

(can theme pub designers just stop doing this? It was novel in the
1980s)

Paracoaster

A coaster that sticks to the bottom of your cup/glass and then
falls on the floor