I just watched this for the first time in a while last night, first of all, it’s worth it alone for the “head explosion," but secondly, does anyone have a definitive answer what happened in the very last scene?

Scanners is a classic and one that I watched in the days when you rented Betamax video tapes.

What happens at the end? How can anyone tell you without spoiling the whole film?

However Wikipedia currently seems to agree with my interpretation, see http://en.wikipedia.org/wiki/Scanners

Does Hitler smash the pink elephant?