Counter clockwise rotation of planets?

Uranus' unusual tipped over spin axis may have
resulted from it forming from a collision of two large bodies.

Llanzlan

Can someone describe a picture for me of how say for example two huge
gaseous bodies that collide actually alter each other's spin axis and what
not. I understand the huge pressures of gas and that the pressures increase
as you go deeper into the planet, but still is it possible to alter the spin
axis that much of such a huge gaseous body such as Uranus by another gaseous
body? Also just for the hell of it, is there anything in our solar system
that could actually go through one of those gaseous planets and I mean like
some huge body? I am guessing not and it seems like a stupid question, but
here on Earth it just doesn't go hand in hand like that, that a gaseous
bodies have strengths of those made of metals and so on. Anyhow carry on and
I'll cut my ranting.