[GLaDOS couldn't help but raise her eyebrow at the female before her. It'd become something of a habit, ever since she'd gotten her new human body. Still, it was fitting in this case. The AI outstretched her hand to the side, in a gesture as if to say "Well?". Finally, she spoke]

Someone gives you a free gift and you don't invite them in? I understand those neck-bearded old scientists wouldn't know manners if it bit them on the proverbial hindquarters, but that doesn't excuse you from not knowing proper manners.