How should the Undertaker go out at Wrestlemania? ?

Taker is probably going to retire in a couple years. How should The Undertaker go out at Wrestlemania? Here are some pretty cool possibilities. He goes out losing or winning a casket match, He get's buried alive, or wins his last match and afterwards he does his hand pose and pyro lighting hits from the ceiling to the ring or ground and the lights go out and they come back on and he's gone. Maybe Kane could come out masked or something and say "Brother R.I.P." and suddenly lightning hits by him or something. What would be a prefect way for him to go out? Be creative and realistic.