but slightly OT.
It's happened in the Tube in London, and recently on a full, narrow-body where there was no AIR.
If I start to overheat, and fanning (hand, safety demo card, magazine whatever) doesn't cool my face, I get r e a l l y panicky and start pulling off layers and heading to floor level where (a) the air is usually cooler, and (b) I won't have so far to fall if/when I faint.
Recently I swam upstream against pax boarding, to stand in the galley opposite entry where there was enough cooler air coming in through the jetway. When I mentioned I was going to faint for lack of air, the FA grabbed the intercomphone and said, "Captain, we're going to have people fainting if we don't get some air in the cabin." Almost before she hung up the air packs were on full tilt. Makes me wonder; does the flight deck know or care or even avert...?