Yoshi and Dr. Hoshi managed to win the race against a bunch of Miis in the Super Bell Highway yet they accidentally went down a train tunnel that caused them to steer away from the train station and they hadn't a clue how they got in the sewers.

"Doc I definitely think we took a wrong turn."

"What gave it away?"

"The fact that it smells awful down here."

"Well frankly I find your attitude to stink more than the sewage!"