A common condition in which one does dot have enough caffeine in their system to operate normally. Symptoms include drowsiness, staring at walls, and an inability to tolerate other people, often accompanied by a headache. The only known cure is more caffeine.
George- "What's up with Steve today? He was staring at the wall, and the second I tried to talk to him, he freaked out and told me to go away!"
Tom- "I'm afraid he's got Caffeine Deficiency Syndrome. I'll go grab him a coffee."