The two 'Chris'es went at it on Twitter.
Comicbook.com says it all started with Chris Evans sending Chris Pratt a happy birthday message on Twitter.
The image includes a dog going pee on a fire hydrant.
A sign next to the hydrant says "'Property of Star-Lord Dogs beware!'"
The fire hydrant was styled to resemble the Star-Lord's helmet.
Evan's message read: "Happy birthday @prattprattpratt from me and this giver of zero f*cks. We hope you’re getting showered with affection today."
Star-Lord actor Chris Pratt jokingly replied to his fellow Avengers: Infinity War actor Chris Evans (Captain America) with a funny one-liner.
"You'll be hearing from my lawyer".
Avengers: Infinity War is now playing in theaters.