I once had this gross coffee syrup type thing, which you were supposed to squirt into milk and drink that way. Now, I'm not entirely lactose intolerant, but for some reason I can't drink milk unless it's seriously diluted, so yeah, I took a sip of this stuff, and knew the milk would make me sick. What did I do then? Oh, I just squirted in a bunch more of the syrup. It was a brilliant plan that could not fail! I used to do it all the time with chocolate milk as a kid, so coffee should be just the same.
Yeah right.
Anyways, I wound up with some pretty freaky heart palpitations going on, and had to sit down for a while before going to work. I also drank a lot of water to try and dilute it, but didn't feel terribly good all morning. Needless to say, I chucked that coffee syrup in the garbage next time I saw it.