Heard people speak of strange sensations often. Besides claiming to be wearing a hat another popular one is feeling like you've wet yourself/that you are wet. My friend also once claimed during a trip that it felt like something was statically clung to him(akin to a dryer sheet), I obviously checked and saw nothing. Finally when my friend took one to many blotters and started in on the downward spiral and he became obsessively convinced his nose was bleeding(he gets frequent unknown cause nose bleeds). He nearly ripped out an entire Kleenex box trying to stop it and it took me quite a while to get him to get off it. I even had to dig into the garbage and turn on the light to show him there was no blood anywhere on the tissues.(he claimed to be seeing blood on the tissues at first, most likely visuals).
Edit: I've seen many freak-outs and have witnessed the thought loop induced speech repeat many times. The nose bleed friend was stuck on "Am I dead?" and "So this is hell!". My belief was ego death began and he ran. Though he wouldn't repeat whole paragraphs or anything, just short blurbs and little conversations/thought patterns.
