You know you're a parent when ...

Instead of James Blunt's You're Beautiful running through your head, you've got the version that he sings on Sesame Street, entitled Oh Triangle.

Seriously.

And what's more, you know you're a parent when you tell other people that the triangle version? Is pretty good. Any song where they work in the word hypotenuse has to be pretty clever. And the expression on his face as he sings -- where he's desperately trying not to laugh, and trying to be very soulful? HILARIOUS.

In fact, I bet my face looks like that most days.

(For the curious, here's the youtube link.)