Another thing I enjoy doing is deliberately adding an extra syllable, or mispronouncing a random word in a sentence to see if people notice.
I mix metaphors or toss out meaningless phrases, to see if people notice.
My favorite meaningless phrase is "You know what they say ... you can't tell which way a train went by its tracks." When we're discussing some issue in a meeting at work and the conversation trails off without coming to a conclusion, then I'll say that. Only rarely do people look at me and say, "Huh?" Most of them nod and say, "Yup." ... and I know they weren't paying attention. If I say, "You know what they say...", my kids will repeat the rest.
I'm looking for new meaningless phrases, to try to diversify. I came up with "You can't burn a bridge in a blizzard" but I'm not sure how good it is. I'm still stewing on that one.
My favorite mixed metaphors:
I'll burn that bridge when I get to it.
(Mixing "I'll cross that bridge when I get to it" with "burning bridges")
Even a blind squirrel is right twice a day.
(Mixing "Even a stopped watch is right twice a day" with "Even a
blind squirrel finds a nut once in a while" - two phrases with the same meaning and usage)
Is the bear Catholic?
(When someone asks a question where the answer is an obvious yes, people will respond with another obvious-yes-question: "Is the Pope Catholic?" or "Does a bear poop in the woods?")