yep thats what you do
pretend you are tilted and blast the jungler when he comes in
that way you keep the enemy jungler away from your allies and then drop him low so he can't gank anyone else or counterjungle after
Or stay just safe when you see him on your ward in a sidebush and then keep getting into ''dangerous'' positions to make himt hink you didn't see him but stay just out of reach or only in reach for a no more then a second at a time before falling back to safety again
i have seen junglers stand in my sidebush for 3 minutes that way thinking they can get a gank off
some of them are actually stupid enough to stick around for extended periods of time wasting so much time they could have gotten twice the gold and xp by farming.
another thing i do when i play sion is make the jungler come to me by pushing and tautning them in all chat and then when he arrives i escape theri gank with my ult right into my allies lane and gank someone else myself
it's safe since the jungler can't countergank :P because he is in my lane