If someone thinks about playing lottery just tell them to bet on '1 2 3 4 5 6' (or whatever the number of numbers in your lottery). Once you realize this combination is as probable as any other the chances of winning seem a lot smaller.
That is true, but as a side note i discourage you from betting on that sequence as a lot of people that studied probability end up betting on that same sequence out of spite and if it actually comes out the winnings will be much lower than expected.