"I can break these (or I can break these cuffs or I can break these/this ____)" was a gag used by the Creatures, however it is not used as much anymore, although Nova still has shirts saying "I can break this pig." It means when something is difficult to pass they say it (Example: When a door is taking a long time to break: "I can break this door!").
An internet meme, I can break these cuffs, was noticed by the Creatures. In the video a man was being handcuffed and kneeling on a police car, he then said the phrase and screamed as he attempted to break them.