Oh! Look at you angsting!

Thanks! I've been practising!

Hee! Steve being polite to technology is great! I can totally see Tony watching him thank the doors every time and being like, "That's going to get old so fast."

Tony: I thought you were Captain America, not Captain Canada.
Steve: I'm sorry, it's a reflex.

I had a bit of a fic once where Steve is trying to talk with JARVIS and is never sure if he's supposed thank him or not.