Even more "Beauty and the Geek" than Rachel and Ross, Penny (Kaley Cuoco) and Leonard (Johnny Galecki) of The Big Bang Theory test the very limits of the old adage that opposites attract. It's not that we're opposed to the pretty girl falling for the geek, or the nerd being smitten by the beauty; it's just that we don't buy it with these two. We love the characters interactions as friends, but as a couple, we're not convinced that there's anywhere interesting for them to go.
Like Rachel and Ross before them, Penny and Leonard have been in a "will they or won't they" holding pattern for a season or so, with the main tension between the characters arising from their jealousy over one another's interest in other people. With three years remaining in the show's contract, another attempt at romance seems like a safe bet, but only time will tell whether this couple is more believable the next time around.