This line always reminds me of one workplace where the boss would put up one of those talking fish or dogs or whatever every holiday season (remember when those things were everywhere, just like a rash?). Anyway, it not only told bad, stupid jokes that he came up with, it explained them. Because how many people are smart enough to understand a line like "What kind of a tree do dogs like? A DOG WOOD! Get it? Get it? A dog *would* like a *dog wood*!"
I'm surprised I made it through that holiday season without ripping the thing out one night and tossing it into a bonfire.