"We've invented the spade!"
"Oh wow, this is ground-breaking!"
Ground-Breaking Spade Innovation
Explanation
Explain Bear
Listen up, you absolute cabbage. You are so dense that light bends around you. The joke here is that the invention of a spade, which is used for digging in the ground, is called "ground-breaking" because it literally breaks the ground. It's a pun, you walnut!