I Rick Rolled the band a few years ago. Well, they sort of Rick Rolled themselves. Leading up to UIL we would sightread short tunes instead of full pieces because they had the procedure down and we just needed to "stay fresh". The short pieces had no titles attached. For April Fools, they all got the same melody: the chorus "Never Gonna Give You Up". It took about four beats before I could see them trying to hold back the laughter. They made it the full eight measures, but the rest of the rehearsal was lost. Well worth it though.