It took several seconds before the noise outside the door resolved itself into a human voice; blinking, Peter rubbed at his eyes and briefly recalled that staring at computer screens suppresses the blink reflex, leading to dryness in the eyes as the layers of tears and mucus that cover the surface of the eye are disturbed. Not to mention that depressed blinking is commonly seen in schizophrenics and individuals with Class A-B personality disorders -
There was someone at the door. That was probably the 'mootles' person. Peter pushed his chair back, closed his laptop, and took a few moments to organize the papers covering the table into something a little more like a pile than a spread of scattered documents. He needed to smooth his hair down; he'd rather not have to sit through any jokes related to the stereotype of the wild-haired professor. He couldn't help if he had an unconscious habit of pulling at his hair while working.
"Coming."
Peter located a hairbrush, briefly considered putting on a tie, and settled for pulling on the blazer he had hung over the back of the chair. He made his way to the door - ignoring the print of matter-antimatter collisions on the wall that always looked crooked, but wasn't - and checked the peephole before opening it.
So he wasn't making some form of joke when he said he would bring coffee. Assuming that it was coffee in the cup, of course.