When it comes to sharing saliva, we only do it with our partner or when our kids cannot finish up their half eaten food. Other than that, the saliva of another is often considered as anathema. Well, if you want to play a prank on your friends the next time around, why not offer to make them their favorite hot beverage? Once they agree, just obediently head off to the kitchen and start the necessary preparations, using this £4.99 I Spat In This Mug, of course. Once the drinker finishes his or her beverage, they are in for a mind-blowing surprise. Works best with dark colored beverages like coffee and hot chocolate or Coke, plain water just will not do.