I know what you're thinking, why in the world would you watch an hour of commercials of your own free will. Well I actually got a chance to preview this (which does mean I was lucky enough to watch commercial free) and I genuinely laughed out loud more than a few times.
Keep an eye out for the Dorito mouse commerical, "The Honkin' Bastard" (which advertises nothing as far as I can tell, just hilarious) and the dude commercial from Bud Light. There's actually tons of funny ones, but these stood out and made the hour worth it to me.
Here's another good one I had never seen before this. Neil Patrick Harris and Old Spice, because he used to be a doctor for pretend:




So let me get this right.. you got a commercial-free screener of commercials? OK, then.
I love the Doogie Houser commercial. I've only seen it a couple of times, but it made me laugh. Plus, NPH! Always fun.
Another one I love and will watch on purpose is the baby buying stock, so successful that he rents a clown, but finds him too creepy.