Mine would have to be the batwing on Top Gun: The Jet Coaster (carowinds) diving under the walkway with the misting effects is wonderful (especially at night).
BTW: Arent the Immelman and diving loops actually the reverse of each other? Here is my understanding of them
I-man: start at a low altitude, climb up to a higher altitude like a vertical loop till inverted, straighten out via a corkscrew-type ending and maintain the higher altitude.
D-loop: start at a high altitude, slight climb like a corkscrew till inverted, drop to a lower altitude like a vertical loop, straighten out and maintain the lower altitude.
Is that right or am I way off base here? Holla back.
the hostyl one