It also looks like the 6'4'' actor ripped the sign off the wall in order to take stage the picture.
Amell, who is friends with Padalecki, took the joke in stride, responding, "That's the best thing that has ever happened in my parking spot," via Facebook.
But it didn't end there. Ackles led the next offensive in what could easily become a full-scale CW Civil Prank War on Monday. He posted a video abusing The Flash set on Twitter with the caption reading, "Hangin on the #TheFlash set w/@jarpad .. Hey @grantgust how do u get any work done with all these rules? #NeedNaps." Check it out below.
Shots fired, Amell and Grant Gustin. Let's just hope both stars stay away from Supernatural's beloved Impala when they retaliate.