Gary Larson’s The Far Side is known for its surreal situations and witty dialogue, but some of his best gags come from thoughts, not words. In comic art, creators often use speech balloons to show speech and thought balloons – or thought bubbles – to show what a character is thinking. Larson was no stranger to the latter, often hinging his jokes on hilarious thoughts that only the reader could see.

https://screenrant.com/funniest-far-side-comics-thought-balloons-gary-larson-list/