I've been in a debate over objective reality which has wetted my appetite, but unfortunately the individual I was debating refuses to engage in actual philosophy. So now I bring the question to all! Can you prove objective reality exists? That other minds are real, that you're not a brain in a vat, that there is an objective universe, and so on? Arguments and evidence are great, but proof would definitely win you some points, though I don't believe such proof is possible.