Suspected myth of bullet rising after leaving muzzle

I'm having a small dispute with a friend of mine. It goes like this:

He asserts that after a bullet leaves the muzzle (from for instance a rifle), "aeroplaning" or some other metaphysical force will cause the bullet to rise shortly before gravity sets in. If I've understood him correct he even means it will start to fall then rise and the fall again as gravity overcomes this "mystery force" of his.

I strongly suspect this is a myth (with the basis in the compensation the shooter makes taking gravity into effect) and I'd expect gravity to immediately kick in making the bullet begin to fall as soon as it leaves the muzzle.

Now, I may of course be wrong. He claims to have several videos backing him up but I'd need a really good reason for believing something so counter-intuitive.

As we both live in Denmark and aren't used to handling guns on a daily basis so we've agreed to abide by whatever the NRA forums tels us.