I don't think he realized he was shouting at me. At first chance I ran into my house and shut the door. I'd consider that poor manners under most conditions, but this one was deserved. He confessed hours later that he had consumed two caffeine pills, a double espresso, and gone back for more coffee later in the day. These items are all readily available, especially with a Starbucks on every corner now.
Caffeine pills are easily accessible to students who pull all-nighters.
He took the caffeine pills with lunch. The pills were originally created for truck drivers who drove at night, in order to allow them to stay awake. Caffeine pills can also be abused in order to lose weight, as the drug can cause loss of appetite. This person used them to get a rush. The recommended dosage is one pill every eight hours for most caffeine pills.