GMC Puns

My friend had a truck on his lawn full of firewood for the bonfire planned for later in the party. This guy who just arrived walks into the kitchen and says, "Hey, you know you've got a truck growing outta your lawn?" My friend replies, "Yeah, I planted a couple GMC emblems and it just sprouted up!" The guy, without a moment's hesitation says. "Damn, that's a real bumper crop!" Everyone in the kitchen died laughing and the guy, who didn't really know anyone there, instantly became the centre of the party.