Bacon milkshake.
[ul]
[li]16 oz - 773 calories, 40g fat (28g saturated fat)[/li][li]24 oz - 1,081 calories, 54g fat (37g saturated fat)[/li][/ul]
A vanilla shake has fewer calories (and fat), but chocolate beats them both.
But would you marry your meal?
That story was on our local news last night, and the anchors sampled the shake on the air. They agreed that people who like bacon would really like the shake.