Another James Potter headcanon. We all know that he would unnecessarily run his hand through his hair. But when he was nervous, he would take of his glasses and wipe his glasses.
"Ready for the Quidditch Match against Slytherin today?"
"You got it!" *wipes glasses nervously*
"Prongs, I think Evans is about to ask you out!"
"Oh, cool." *casually whips of glasses*
"NEWTS are tomorrow!"
"Yep." *wipes glasses so hard he nearly breaks them*
"James, I'm pregnant."
"Oh, really? That's nice." *furiously wipes glasses*
"Lily, it's him! Grab Harry and go!" *breaks glasses*