This only works if your a Lock or Hunter (and have a pet) - I know this works because I get it done to me all the damn time!!
If your in a battleground and you see a Rogue in the distance heading towards you, (for example in the Eye of the Storm, where you can be at a base and see them coming on thier horse over the bridge etc), target them no matter how far away they are, and sent your pet to attack.
Naturally the Rogue will hit stealth when they get close however for some (really annoying ) reason, as long as you hit attack before they disappear it does'nt seem to register with you pet that they are stealthed, and the pet will still find, intercept and attack them removing thier stealth and leaving them exposed.
Small tip thats the bane of my life