A banana surprise happens when a male is mid coitus with his female partner in the dark and says " Do you mind if I try something different?" After getting permission said male then reaches for a banana he has stowed earlier, peels it and then begins gently rubbing the banana on the females genitals. After a few minutes said female should ask what is that which then the male yells "Banana Surprise!" and shoves said banana into the females vagina at full force.