Well I know cheesecake would be high up there. Also the other things that are really fattening are the Wendy's Baconator, and the Stake and Shake Frisco Melt.
This doesn't answer your question, but nuts are full of great fat, so you shouldn't worry so much about the fat content. You need fat to survive, so cut out most of the "bad" fats, and feel free to...