Ds'school has come up with a league table for reading genres, and the Year 7 kids have to pit one genre against another, eg novels vs poetry. He's read most of the genres, but I can't think of a short play I can genuinely expect him to enjoy; however, there must be one out there - a funny one would be good, he's a Monty Python fan, etc.
He's been in lots of drama productions and enjoyed them, but this project requires him to just read the script for enjoyment, not act it out or learn lines. I think it has to be a short one so he can get to the end of it, and I'd prefer not to put him off reading plays for life (not that I've ever read a play for enjoyment, only for school).