Clipped In-cident

That while riding along on your bike behind a parade, the parade participants will stop suddenly (as parades are wont to do) and you will slam on your bike's brakes successfully bringing your cycle to complete stop — but in that millisecond that you remain upright, you will realize that your feet are still clipped into the pedals and while your life flashes before your eyes you will tilt sideways and then, at increasing speed, crash sideways into the earth.

Air Critter-ditioner

That the air conditioner that you left in the basement or on the porch all winter is now home to funnel-web spiders and brown recluse spiders and all manner of killing insects and that the device will spray these critters all over you while you rest in your cool bedroom unaware of the danger.