My 7 month old son is just reaching the stage where he pulls himself up to a standing position every chance he gets. He uses tables, chairs, my leg, whatever he can get a grip on. Of course, he's getting a lot of bumps on the ol' noggin from falling over all the time. Cracks me up...he'll fall over, cry like a banshee, and a few minutes later he's back at it. What really gets me is when he's crying he'll look at me like it's my fault...maybe I shouldn't laugh at him so much.
Yeah, it gets frustrating from time to time, but fatherhood is something that once you experience it you'll never wish it away.