Aha, yes, I have definitely heard as much from many different people. As for me, I can decidedly say that it was Strange Bedfellows (the first fanfiction I ever read) that first turned me on to the pairing, which is probably rather strange considering that at the time, the story had not even begun to hint at any sort of shipping between the ponies!
One of the few fanfics I've ever read. You can't go wrong with RariJack!
It was one of the first ones I ever read.
It makes Rarijack one of my OTP.
This picture makes it perfect.
Rarity: Me neither
30 min later this pic