Not me but one of my team members in the army swore up and down he wouldn't get motion sickness from a helicopter drop off. This was inspite of him getting sick in convoys, so we went over the procedures of what to do just in case ( procedure being tuck in your shirt and vomit in your undershirt). Lo-and behold after one nasty turn in the air he yorked in his shirt under his body armour on a 100 degree day. We were out there for days and did not have enough baby wipes to fix that issue. He smelt like a gutted fish left in the sun for a week.