Patrick Troughton running away from Jon Pertwee during a water fight on set I am so done
I’m pretty sure this is from a convention
Yep. This is from TARDIS 21, which took place in Chicago from 23-25 November 1984. What you’re seeing here is the climax of an epic duel between these two total dorks as they chased one another up and down the hotel corridors armed with water pistols; and Jon has just decided to up the ante.