He can open my paddock gate (and will assist you in opening it, usually clonking some other horse in the face) without a problem.
It swings inward so if he's inside, he'll pull it open with his top lip, and when he's outside, he'll push it.
Well, I recently started using my pasture gate because my new colt is in the paddock at the moment. The pasture gate opens in the opposite way, it swings outwards instead of in. Loki, deciding he wanted to come in NOW (he was turned out at the time) tries to push it inwards...with no avail. Not to be foiled by this seemingly complex problem...he tries again. Still, it will not open!
Smarting up a bit, he tries pulling it, and it works! The gate is open! And Loki...isn't going inside...? The pasture gate crashes into the adjacent paddock gate, and Loki decides to get a little revenge. He then proceeds to smash the evil pasture gate into the paddock gate, using his nose to bounce one gate off the other.
After a minuet of this, he is finally satisfied and walks into the pasture. But alas! His grain has not yet arrived. So Loki turns around, pushes the gate...and leaves again.
Can't help but love that silly boy XD