The most useless skill

Firemaking is useful in the sense of you lighting light bulbs (thank god for electricity in the real world ;]) for those dungeons and lanterns etc and it's the only really most used skill in real life but I'd say Construction besides teleports and etc it's completely useless and more of a show off skill to me. Or even thieving cause because majority of items besides spectre you can get yourself. That's just me .