Did you ever read Punch magazine? They had some great covers. A favourite of mine were a group of skydivers holding hands in a circle on the sea bottom and one is saying to another; "I'll never get used to these metric altimeters".
Another favourite has a UFO landed in America and a number of top people are there, including the top brass. The ramp of the UFO is open and down it are walking (alien) humans dressed in red Indian clothing. One Government man is saying to another; "God, this is going to be embarrassing."