The most common question I get is about the Oxford comma and whether it should be used or not. Personally, I am neutral on the argument, but here's a bit of a fun English riddle to help you with it - "What’s the difference between a cat and a comma?"
A cat has claws at the ends of its paws and a comma is a pause at the end of a clause.
A fun riddle - What is the longest word in the English language?
SMILES: there is a mile between the first and last letters!
A riddle to help with critical thinking when it comes to developing ideologies and creating new ideas (it's not a math question!) - Can you make seven an even number?
YES, remove the 'S' from 'SEVEN' to make 'EVEN'.