is it bad to slam down a whole cup of coffee?

I don't drink a ton of coffee, but the amount of caffeine in a cup will fuck you up if you take it on an empty stomach all at once. If it hurts, induce vomiting

I gulp down Monster sodas in a few minutes all the time (though not usually more than 1 a day). But it takes a big caffeine dose to affect me. I once took 2 yellow jackets and 2 no doz and tons of coffee and stayed up all night. I was so sick the next day that I couldn't even keep down water.

I remember once I was freaking out over a test so bad that I got to school like 3 hours before test time and chugged like 3 expresso shots to study. Ended up taking a 100 question test in 9 minutes and then sitting on a bench outside the classroom waiting for everyone else to finish while debating whether or not I wanted to call an ambulance or something cause my heart was racing like crazy. But I got a 97% so yaaaay :P

Well grats on getting better, but a smidgeon of advice, esp with caffeinated drinks (including coffee) the rate you consume something also increases the rate your body processes it. This is most clearly seen with alcohol, though one's tolerance does factor in. You'll notice that people who have normal tolerance who drink really quickly also get more drunk faster (for those of you trying to save money but like to drink, chug less drinks harder and faster. XD) For Caffeine, I don't recall immediate effects upon mass and fast consumption besides increased heart rate and sometimes increased urge to use the restroom. Eitherway, I'm no doctor, but experience tells me you shouldn't down much of anything at all unless you're into feeling distressed. XD And dayum, you're lucky that you retained your memory and focus, Xueli! I only get improved reaction time when I get caffeinated.