I've never really had any imaginary friends when I was a foal. I guess I didn't really have time for them. I mean, I had my books and my BBBFF, so I didn't really feel like I needed to create one.
I guess that's why I found it so strange when Rarity came to me, asking for help with Sweetie Belle. Seems she had managed to pick up one of her own, and it was starting to cause some problems. Well, of course I'd be willing to help Rarity in any way I could. What are friends for?