I always cheated at that one and pretended someone had asked me a question next to me. Or that I had misheard them.

"Oh yeah you can have my spoon sorry about that it's crazy here anyway..."

Or "I'm sorry WHAT about a dragonfly?"

My favorite was finding new ways to accuse chiropractors of fraud.

"Oh yeah it looks like you had the wrong diagnosis code in there, see this is for kidney failure. Haha I know you're just a chiropractor and you're not trying to treat the kidneys DOCTOR." Really lay it on thick with the doctor, because if the chiropractor is calling himself he's almost guaranteed to be one of the pricks that insists he's a real doctor and not a street magician with a degree.