This video is a couple of years old, but it's picking up a lot of traction on the interwebs ... and for good reason.

A couple decided to film their parents' reaction to news they left for them that they were going to be grandparents.

The mom, as you would probably guess, completely freaks. As for the future grandpa, his reaction is pretty typical from a man.

He stands there quiet, seemingly in disbelief, scans the room for a hidden camera, thinks he doesn't see one, and then ... well, you just have to see for yourself.

Priceless!