The combination of sleepy, horny, and hungry. The worst combination imaginable. Too sleepy to fuck or eat. Too horny to sleep or eat. Too hungry to sleep or fuck. So you just lay there and slowly crumble away. The only way to fix the problem is to take care of two of the three things at once.
Shannon: Fuck me!
Zack: I can't! I'm shlorngry. Bring me some pie and maybe then.