On the night of April 14, 1865, Parker saw the president and his wife to their fancy box seats in Ford's Theatre, then sat down in the hallway. But there was a problem: He couldn't see the play from there. So he decided to abandon his post and go downstairs. But alas, even with a better seat, Our American Cousin wasn't to his liking, so Parker ran off to the bar next door at intermission to get a drink with Lincoln's carriage driver. At the bar, it's possible Parker even got to see a celebrity; actor John Wilkes Booth happened to be there too. Talk about a magical night!
Booth eventually left the bar, but it's unclear whether Parker did. For all we know, he found out the president was dead while nursing a hangover the next morning.
Library of Congress