Yes!!! Have been thinking evil thoughts of that type, this friend is just asking for it!!!!
Was thinking more of waiting till I can get an aerobatics rating, flying along nice and easy, then doing a sudden wing drop or stall turn or similar (with prior approval of course!) and scaring the daylights out of him!
Can guarantee no more teasing!!
But the fainting idea is priceless!!!
It'd be great to get ATC in on the trick too but I suppose that'd be illegal.....
Sky