I also love to mix metaphors. I think it is hilarious. However, when I do it, people either correct me or don't get it at all. When did people stop using those funny, metaphorical sayings? "We've got to strike while the iron is hot," for example. I know no one smelts anything anymore, but one doesn't need to be a smelter to understand the reference, right? But I digest...
Mixing up vocabulary can be a wonderful humor test. If you watch The Real Housewives of Atlanta (which I do, but ironically), you remember Kim spelling "cat" with a "k," seeming to not know that she had just spelled the word wrong? Wasn't that great? That's how I feel when someone uses the word "continent" instead of "consonant," or "detonation" instead of "denotation." I love it, and laugh merrily on the inside while, externally, I am frowning to indicate my level of commitment to the conversation.
So, to circumcise: Using a totally inappropriate word is something I find completely hysterical. I intend to continue to enjoy it; I might as well have my cake and go to Rome when my pants catch fire in the bush.