I see what you did there

An expression used to acknowledge that one understands a joke made by someone else, and to either show appreciation or a lack thereof for the wit employed. Ah, I see what you did there: you compared me to a pig because I'm a little overweight. Very funny, jerk. A: "Grin and bear it! Because you're dressed in a bear costume!" B: "Oh, I see what you did there. Now will you stop making such dumb puns?" A: "What did the surfer say about the London Underground? 'Totally Tubular, dude!'" B: "Haha, I see what you did there!"