My 3 favorite (in no particular order):
1) Cream cheese stuffed pretzel @ Lunching Pad in MK
2) Baked/Unbaked flavor of ice cream @ Ample Hills- Boardwalk- chocolate chip cookie dough AND broken up chocolate chip cookies mixed into an awesome ratio of vanilla ice cream- YES, please!!!
3) Frozen Brown Elephant @ Refreshment Coolpost in Epcot (Africa)- Frozen Coke Icee mixed with some type of South African cream liqueur- it is wonderful