What Part of "I Feel Like Crap" Do You NOT Understand?

If I walk into work head in hands, eyes squinted in pain, and I head straight for the Excedrin, what the fuck do you think that means?  If you haven't yet figured it out, it means, "leave me the hell alone."  If you feel like your head is splitting in two, do you really want someone snort-laughing in your ear, completely oblivious to the fact that you feel like you got run over?  Twice? 

I consider it common courtesy to feel out a situation and respond appropriately.  If a friend or coworker is obviously (because they've even told me so) not feeling well, I will step away from the ill party and LEAVE THEM THE HELL ALONE.  Don't make me yell at you then act wounded because you are the one who failed to properly decipher body language paired with spoken English.  It will get ugly if you don't step away and I won't feel one bit bad about it.  Where were you when they taught social interaction in Kindergarten? 

Am I crabby?  You bet your ass I'm crabby.  My sinuses are staging a coup, my head is going to explode and I feel like shit.  Do not make me talk about how excited you are to be getting your Girl Scout Cookies at 8 AM. Consider this a fair warning.