The Muggles remain, for the most part, oblivious to the wizarding world. This situation is considered preferable to the alternative by wizards; official coexistence, conflict, or wizard supremacy (advocated by some pure-blood supremacists). Most things of magical nature are hidden or otherwise obscured from Muggles; others, such as Dementors, are invisible to them, although they experience the same depression and sense of manifest darkness and despair while near a Dementor. It is commented that Muggles generally dismiss anything they cannot explain. Likewise, to many magical people, many functional aspects of the Muggle world are rarely glimpsed and mysterious. Wizards and witches' attempts to disguise themselves as Muggles, as when they have to venture out onto "normal" streets, often have humorous results. When magic is seen in the muggle world, the Ministry of Magic is often tasked with clean-up. The mispronunciation of common Muggle terms like "telephone", "escalator", "plumber", "firearms" or "policeman", as "fellytone", "escapator", "pumble", "firelegs", and "please-men", respectively, is a running gag in the series. Arthur Weasley is known for being fascinated with the muggle world and has a vast collection of muggle objects.