I saw some fucking hilarious fraudulent transactions recently.

Referring URL for all his transactions? The linking code page from within the affiliate program.
Email addresses for signups? Same username as his account name.
And then he had the audacity to contact someone and ask what was going on. When told his account was canceled for blatant fraud, he seemed stunned.
But no less stunned than we were to find him doing the exact same thing the next day. Funny stuff.