At Point O Woods, the 15th and 17th sort of share a tee box, as do the 8th and 18th. They don't really cross each other at all, but it's one contiguous mowed piece of ground, set in a V shape, such that the back tees on each hole could conceivably be set pretty close to one another.
At Ridge Country Club in Chicago, the 15th hole plays to the north, and the 5th hole plays to the east. These tees are in the same spot and actually cross each other if I remember correctly. Such that if you were teeing off on the fifth hole, a short par four (even by Ridge's standards), and someone was teeing off on 15, the person on 15 would be hitting over your head (it's slightly elevated about the 5th tee). I don't suggest teeing off on 5 if someone is teeing off on 15.