Just for fun. Here's one to get you started. What two things should never be mixed? Laxatives and sleeping pills.
I just thought of another one....metaphors! How’s this for a groaner?: Leaving a sour taste in the client’s eye. How about this? Not the sharpest cookie in the jar. One of my faves: A stitch in time saves sowing wild oats.
You shouldn't mix bleach and ammonia. A TSA agent (airport security) & jokes about concealed weapons. A beach volleyball game and a polar vortex.