When helping out a classmate in business class, and she seems to be spacing out, don't wave your hand in front of her face and jokingly say "Hello? Are you listening?". Remember that you just met her 4 months before and forgot she has epilepsy. That was a seizure, although she was perfectly aware of the hand thing. #LFMF PS. she was perfectly fine 5 seconds later, and thankfully found the entire situation hilarious.