I'll give you an example, but there is no way you are going to appreciate the effectiveness of this without knowing our son, his history and his temperament more than you do.
He was given an assignment where everytime he regarded himself as an "exception" he was to announce it. In other words, if they were told to go wash off their cups, and he thought to himself, "I don't have to do that right now", he had to announce that he was an exception. It was humorous, but very effective in teaching him how often he saw himself as an exception to everything. (not that this has changed all that much- but the awareness of it was a big breakthrough- i.e. the 110 mph ticket last February

) We still use it around here- half joking.