So you're about to take a bite of something delicious, something you've been looking forward to eating - perhaps the most delicious slice of pizza imaginable.
But as you're about to take that wholesome bite, you drop it.
There it is on the ground, time is ticking, what do you do?
Grab it while no one is looking and call it a meal, or give up all hope and walk away?
Massey University bimolecular senior lecturer Heather Hendrickson spoke to Paul Henry this morning to talk the science behind the 'five-second rule'.