A man wearing red swim trunks and a red swimming cap is diving off a cliff.
A man in blue trunks is sitting on the cliff.
The man is either in blue or red trunks, also he is either is sitting on the cliff diving off the cliff.
Can't be wearing blue trunks if wearing red trunks. Man can't be sitting if he is diving.
The man can't be wearing both red and blue swimming trunks.