Have You Ever Been "THAT" Guy/Gal?

At my school's Battle of the Bands concert, this one band VODKA was playing Porcupine Tree's Open Car (yes.... the only other kid in my school that listens to Porcupine Tree just happens to be the school's best drummer) and I swore it was the end of the song.... but I guess they decided the song was too short and wanted to sing the chorus again. And of course I was the olny person who clapped cause I was the only person who knew the song.....