Let me start with, this joke is about Polo's so in an effort to do some trans-atlantic translations I think these are known as Life Saver in the US. Enjoy!
A college professor was doing a study testing the senses of first year schoolchildren, using a bowl of fruit Polos.
He gave all the children the same kind of Polo, one at a time, and asked them to identify them by colour and flavour.
The children began to say:
Finally the professor gave them all honey Polos. After eating them for a few moments none of the children could identify the taste.
'Well,' he said 'I'll give you all a clue. It's what your mother may Sometimes call your father.'
One little girl looked up in horror, spit hers out and yelled:
'Oh My God!!!! They're ass-holes!!'