Barnes not remembering had obviously put Rogers in a sour mood. Tony couldn't really blame him--best friend not remembering your birthday had to sting. His mouth twitched a bit as he considered his options before finally shrugging, relinquishing the amazingly coincidental birthday topic for now.

"Little white lies are a part of life, Rogers," he said casually, unable to let go of the other probably even worse topic yet. He turned back to the arm, ready to at last start working on the damn thing without any more interruptions.

"Just getting him prepared. Anyway, I've got a highly advanced, highly damaged neural prosthesis to repair, and believe it or not it's not actually going to be a walk in the park. I'm not used to working with people all up in my space, so keep it down and keep me out of it, shouldn't be too hard for you two--Dr. Sulky and Mr. Hyde."