Showtime had purchased a mega mushroom at an exotic market because of his strong cravings of a snack. The seller warned that such item had to be prepared a certain way, otherwise dire consequences would occur. Of course, the yoshi doesn't take the seller's advice and eats the mushroom rather quickly, almost swallowing it instinctively. The effects of the mushroom worked rather quickly on Show, causing him to grow to epic proportions as shown. Apparently that mega mushroom affected Show more than a growth spurt, causing the dino's belly to rumble. Fortunately the growth effects are temporary, but most likely Show won't be able to hold it for that many hours. The residents of that city may have to evacuate quickly, before Showtime's bowels do so first.
Inspired by the mega mushroom item in The New SMB for Nintendo DS.