People generally cheat in three areas: taxes, expense accounts, and romance.
Never cheat on someone who's good to you. Karma is a bitch.

The first and worst of all frauds is to cheat oneself. All sin is easy after that.
Infidelity does not come from a lack of love; it comes from a lack of respect.
Cheating on a quiz show? That's sort of like plagiarizing a comic strip.
Cheating and lying aren't struggles, they're reasons to break up.
The trust of the innocent is the liar's most useful tool.