I recently just respecced into the holy tree on my pally and i had a trinket called Valonforth's Rememberance (Valonforth's Remembrance - Thottbot: World of Warcraft)
It has Chance on spell hit to increase spirit by 222.
So i was just trying to get used to questing as holy and i clicked Seal of Righteousness...And the trinket procced!
I wasnt really sure if its an exploit because maybe the seal "hits" you with the buff or somthing but i decided to post it here anyways :P.
I really hope this isnt a repost and i really hope that it is an exploit =]
Thanks for reading!