T-Shirts: false, error, is missing, absent, x, red, cross, letter, circle, gui, interface, icon, symbol, faux pas, patzer, oversight, schnitzer, mistake, problem, crash, fallacy, hoax, misconception, careless mistakes, misunderstanding, incorrect, computer, www, internet, server, ignorance, illusion, sign, thinking errors, slip, traffic signs, inaccuracy, error of judgement, impropriety, failure, form, design