I ship CaraMac (Big Macintosh / Caramel).
In my headcanon, Big Mac is gay. I dunno why. Go with it. Now, I won't be one of those people who say that "IT'S TOTALLY IN THE SHOW" or what not. What I will say though is that Big Mac did run away from a kissing booth in the comic, and was completely oblivious to two mares who totally wanted a bite of that apple, if you catch the innuendo.
Why? Because it's cute, dammit! Why do we do anything in this fandom! Duh!
Not the cutest, though. PinkieShy is the cutest. But that's, like, lethally cute. Saccharinely cute. Like a fluffy little ball of diabetes wrapped in a fuzzy scarf and topped with a holiday bow in a litter of puppies.
What was I talking about? I taste pennies.