Lance Bass stopped by the Tonight show for a brief homage to “Big Mouth Billy Bass,†the animatronic singing fish, on Wednesday night. When it comes to pun-based musical gags based on novelty gift items, this might just be the pinnacle of the form. Watch the ex-’N Syncer flap around atop a mantlepiece singing “Take Me to the Water,†feel nostalgic for the cottage walls and college dorm art of the early 2000s, and be thankful for Jimmy Fallon’s ability to get celebrities to do weird stuff on television.Â