“They most likely will only sting you if they [are] squeezed or stepped on ... Upon being stung by a carpenter bee, you’ll feel an immediate and intense pain around the site of the sting ...

I'm talking about bug bites, not your uncle. First stop, the bee. There it is piercing the skin with its stinger. Ouch. Then it flies off, leaving the stinger and a tiny venomous sac behind.