sounds like some people dont know what a malapropism is - it is "the production of an incorrect word in place of a word with a similar sound, resulting in a nonsensical, often humorous utterance"
theres a few well known ones like pacific/specific, incinerating/insinuating
My late stepfather, while explaining that my mother couldn't get out any more because of a bad hip said: "She's been harpooned in this house for two months."
Many years ago a group of us were in the pub discussing some kind of ecological problem in the seas around Australia when one girl came out with the statement that it was all due to too many dangerous orgasms in the water. She was quite upset when everybody burst out laughing.
my brother once said he was going to try to 'memorise' me ...
i joked 'im your sister how could you forget me?' he looked at me confused and then talked about hynotising tc - he meant mesmerise.
he then argued with me, when i told him hed got it wrong, and only when i ppointed out the it was named after the a man who 'invented it - Mr Mesmer. (cant recall first name), and that memorise actually meant to commit something to memory, did he accept hed got mixed up. haha