Nothing, absolutely nothing, is more unforgivable than this situation: You're drinking a pint at dinner, and the waitress comes over prior to you finishing the first one. She asks "looks like you're close to finished, would you like another?" You think "wow, what a proactive person, great job!" then when she drops off the new one she takes the previous glass with 1/5 to 1/3 of the first beer STILL IN IT. I believe I should be allowed to stand up and slap this person upside the head! Twice!