Melisandre wrote: 
cant say I blame them when spiteful people have been known to spit inside them.
Green food colouring can be quite amusing.
We had one guy regularly leave his freshly bought eggs in the fridge the afternoon after he bought them. We bought half a dozen, hard-boiled them and then swapped them with his fresh ones next time he left them in the fridge. Apparently, his wife wasn't amused when she went to make a cake.