Valiant Knife, a few of the FF weapons, Limit breaks in VIII, hell just Chrono Trigger...

Its funny this topic comes up since I just totally owned Queen Zeal tonight with Ayla and Frog. Dino Tail and Frog Squash ftw!

I tend to try every tactical item or ability I can just to see if its worth it. Almost forgot the Power Crisis in Xenogears.