In single player mode if you spam the partner call button while waiting at a door, your character can call out to your partner. If you spam it however, your partner replies in agitated tones, with replies like "I know! Relax!", "I heard you the first time!".
Only the A.I. in single player seems to reply like this, as I have tried to replicate the same situation in a co-op game-- my human partner spams while they wait at a door, I hold B and tap up on the directional pad each call out my partner makes, but my character always says "ok!" and never the hilarious animosity the A.I. gives.
Has anyone ever triggered the agitated responses, or is it something only the A.I. can do?