I suggested we try 40K in 40 minutes - but he wanted to use his Centurions so we ended up with 500 points each and waived the No 2+ save rule.
I took two units of Ork Boys, one in a Trukk and 20 foot-sloggers and three DeffKoptas and a pair of buggies all led by a Warboss.
His Centurions had six marines along for the ride, led by a Captain in Artificer armour.
Once they arrived in combat they predictably handed it out to the Marines, with only the Captain's +2 save keeping him alive long enough to take out the Warboss, before weight of numbers pulled him under.
Th Gaming Heir learned a bit about what close combat horde armies can do to elite shooty armies. And about not relying on the impressive big bits of new shiny kit.
Stripped down 40K like this works quite well, so maybe we'll get a few more games in.