When you need to connect two ropes and can't have the bulk of a knot, splicing becomes your only option. If the ropes you are connecting are for low load, you can skip the precise way of making a short splice and go for the quick and dirty, easy short splice!
I used this splice while I was making the rope fenders, not much load and a very easy connection to allow me to keep working.
Simply splice one line into the other burying all the strands. Then release the other lines strands and splice them into the first line. You will now have a very quick and dirty short splice!