The first day at a new job is a nerve-wracking experience. With none of the comforts of a practiced routine and familiarity, it really feels like you're totally winging it and just laying it all out there. Of course, when nerves are frayed and you're feeling jittery, it's more likely you're going to stuff something up, which is why those first-day nerves end up being rather prophetic. This worker made just about the worst first-day mistake you could possibly imagine when they accidentally poure…