This just came to me... there may be more, but don't expect it.
"So, how did therapy go?" Questioned Happy as he drove Tony back to Stark Tower.
Tony though for a moment and then said, "There are some *strange* people in the world, you know that?"
Happy rolled his eyes and waited for the story. At Steve's request, Tony was taking PTSD therapy again, and every session he came back with an interesting story.
"Well apparently Percy had a bad day. He just sat upstairs and watched us through the railing. Didn't say a word. Harry brought in a dead snake. I mean, it was stuffed, but still.
"When Sera, the counselor, asked him about it he said it was 'a victory.' Whatever that's supposed to mean." Happy shrugged and focused on the road. He was only half listening as Tony told his tale, so when he tuned back in he was totally confused.
"I'm sorry, did you say that he chased Daniel around swinging the snake around and shouting avada kadabra for several minutes?"
"Yeah, Sera couldn't get him to stop. It was weird, but then, who am I to judge?"
Happy suppressed a snort. Tony was interesting...but he could relate.