Ugur

Requirements:
Friend who's either a priest or an engineer

Instructions:
1.Get together with your friend near a BG portal (for example the AV portal in Alterac, or WSG portal in Ashenvale, etc)
2.Use PoM and your friend needs to use MC or mind control cap on you straight away (if same faction, do it with /duel)
3.Your friend will run your character through the BG portal while MC'ing
4.After the loading screen, you should be back in control of your character with an infinite charge of PoM.

Note: This exploit should with other skills/talents that work in similar ways, for example nature's swiftness, cold blood, etc.

Have fun

EDIT: This works for me on live servers at patch 2.4.2.