At a recent show at the Crypt in Denver opening for Fast Eddy, Ian Ehrhart – frontman for the punk-rock band Jesus Christ Taxi Driver – leaped off the stage to do his best Chuck Berry duck walk in the middle of the crowd before his band’s first song was even halfway over. Ehrhart’s wild stage presence, influenced greatly by the late, great Cramps singer Lux Interior, is a charming and electrifying habit, but it’s also inspired by anxiety…