Baltimore aquarium had one crack the glass on it's display, back in the day.
IN the aquarium hobby one of their nick names is thumbsplitter.
-Byron
I had two peacock mantis shrimp. They were approx 6-8" in length. I would say that mantis shrimp and octopus have been by far the coolest animals I have ever kept hands down. The personality they displayed is amazing. It is also extremely extremely rare for them to crack a tank.
the mantis shrimp....for Craig.
Not so much...for Donn