Is coworker usually weird? Did she have a blue tooth ear piece in her ear? Maybe she was on the phone or something.
She is mostly normal, but occasionally says something really dumb.
Is she giggling while saying the stupid?? (Further evidence of PBA) Eta: SRRY!! I saw 'spoof' & didn't read further. My bad. Promise I was not trying to be offensive to a legitimate issue!!
Maybe something else popped into her mind and she just happened to laugh while looking at you eating your lunch, that's all I've got. That totally happens to me sometimes though.
Oh my god - do I have PBA?!? I also cry uncontrollably every time I watch Steel Magnolias, and laugh to the point of crying almost every time I hear a fart noise, if that helps with your diagnosis.
"Why would you ruin perfectly good peanuts by adding candy corn? That's like saying hey, I have these awesome nachos, guess I better add some dryer lint." - Nonny
Your co-worker is weird. I think one of my biggest pet peeves at work is co-workers who walk by and look into my cube. Keep your head forward and move along. I wish I could put a door on my cube for more privacy.