Man: I need something without caffiene! And hot!
          (Slams hands on counter) I need a hot chocolate!
Me: Ok, but you know chocolate has traces of caffiene right?
Man: (points his hand condescendingly at me with enough   
           passion and force to pierce a wild bull) No It Doesn't! I
           am so sick of these lies that chocolate has caffiene! It has
           thorabromine, a chemical similar but not caffiene!

Yeah, ok, it does, but it also (ask any chemist and/or biologist) has caffiene. Dear sir,
A: your a bastard not worth my time
B: your brainwashed
C: start thinking for yourself
D: learn what research is

Here endeth my rant, I pray I don't get any more of these kinda folk today, otherwise I may just rip out my beard....