I havn't done a whipit in over a decade. I had a fucking seizure from doing them back to back to back. I must have reduced too much oxygen to the brain or something and started "fishing", flopping around like a fish out of water. Its a really intense experience. I was relatively conscious for the whole episode but I had zero control over my body and felt no pain. I thrashing around, having spasms and drooling/foaming at the mouth. I often think that would have been my perfect moment to die. I'm not that lucky though.