"The ocean, or the world's most aggressive bowl of soup as it's known to many, is home to the plentiful and much beloved sardine, often found in aisle 6b next to the majestic yellow-fin..."
We weren't sure who the 7 ft mechanical humanoid was trying to fool, but it's obvious, hissing laser-guns for hands kept the students from misbehaving. We haven't had another successful field-trip to the aquarium since... It vanished shortly after we left.