Don't sweat the small stuff - and it's ALL small stuff...!
I have a sycamore in my back garden where two trunks grew close together. One of those trunks started to mould around the other throughout its length and in just a couple of years has almost completely surounded it. There is only what looks like a long scar running up the trunk at the moment but I don't think that will be around for long.
never seen one of them before looks cool