In one of the Basic Brewing Radio podcasts I listened to recently, John Palmer mentioned making an American lager with "corn meal right off the shelf" as an adjunct.
If I were in a pinch, I'd rather use ground cornmeal, which has one ingredient, rathercorn meal than a commercially processed foodbreakfast cereal, which has dozens of ingredients, including butylated hydroxytoluene.
On the other hand, actually making applejack with Apple Jacks® could be fun. And what better way to get that characteristic fruity, estery aroma into your ESB than Froot Loops®?
(In case it sounds like I'm being sarcastic, I'm not. An ESB "dry-hopped" with Froot Loops® sounds like just the thing to stick it to people who take their beer too seriously.)