“Do you know who I am? I’m the man who’s gonna burn your house down! With the lemons! I’m gonna get my engineers to invent a combustible lemon that burns your house down!”- Cave Johnson This epic Portal 2 gift allows you to give life its lemons back in lemon hand grenade style. While these might not actually explode or combust…they sure look cool. Each mug holds 12 ounces and is an officially licensed Portal collectible.