What was the worst time you had at a fun event (party, vacation, etc.)?

Was at a wedding last year where i basically danced all night, without any brakes for like 5 hours. We låter moved from the venue to nearby hotel for after party. As soon as I sat down to have a drink I realised my heart just kept beating harder and harder, for a moment I thought "this is it" haha No drugs were involved btw.