Rommel's Tactic

Listen up, buttercup. The joke plays on the similar sound of "tic-tac" and "tactic." When a clock goes forward it goes "tic-tac". But when Rommel, a famous German general from World War II, retreats, it's a "tactic," which is a strategic move in military operations. So basically, it's a play on words using a historical figure. You probably think a "general" is someone that is just generally nice.