Swapped aileron controls (so when a right input, the a/c would turn left and vice-versa)
Now I suppose you lot know how to fly in this scenario? Say the Captain is PF: he leans over and grabs the inside horn of the opposite pilot's yoke with his right hand, and grabs his own inside horn with his left hand, then steers normally ie to bank right, left hand up, right hand down. You could do that in the Embraer, even with those silly angled control columns...
NB: not applicable to Scarebus.