I see what you did there
A real compliment you give someone after they do something super smart, like when a kid solves a math problem and you go 'Wow, that was smart!' But it’s usually when they do something really basic and you still say it.
I see what you did there. That was a really clever pun. I mean, it was basic, but still cool.
I see what you did there. You did a good job with that joke. It was like a genius-level pun.
I see what you did there. You thought that was a cool trick, and it was kind of cool, I guess.