Could someone explain trolling in ranked to me?

I just had a ranked game with a Teemo support who absolutely destroyed our game and i would like to understand this phenomenon. So What is enjoyable in trolling? I have picked weird champs for weird lanes a few times but i only did it in normals with friends of mine to have fun. How is it enjoyable to go in a solo ranked and pick teemo to support tristana and completely forget to give a shit about the game? Is it fun camping in enemy jungle while our inhib is getting pushed in? Is it a good feeling to wait silenced on lane until the whole enemy 5 reaches you then attack and die? How can you enjoy running up to enemies and dying for no reason?

Why does someone do this? I really don't understand guys. Help me do please