Art history is full of examples of movements in art that were ahead of their time and not necessarily embraced by the art establishment. The term Impressionism, which brought artists out of their studios and into the outdoors to capture the movement of light, was a derogatory term when it was first coined by art critics. The style that Pablo Picasso made famous---Cubism---also met with resistance, even among some of the artist's closest friends. The paint splatters made popular in Abstract art still find people scratching their heads, looking to find the picture. Although all of these styles are recognized today as legitimate movements in art, they were not necessarily embraced when they first landed on the art scene, nor were the artists who created them called the geniuses that they are considered today. In short, many people considered these types of art weird.
Found object art by its nature has the potential for being a bit strange, because the objects used are other people's trash. Although much of found object art is quite beautiful, the combination of certain pieces together makes a statement in a way that other art styles may not do quite as well. For example, found art may take a doll's torso and fasten it to the pages of an old book in which the artist paints pictures depicting the roles of women. The juxtaposition of these objects next each other may seem a bit odd, but ultimately make the viewer think about the roles that such items play in the larger scheme of things.
Graffiti is the art of the street and it has a roughness to it at times that's not found in some other art forms. Graffiti artists paint on the walls of buildings, trains and outdoor signs. Their expressions speak a language that other graffiti artists may understand, but not all will. Some of the most famous examples of graffiti could be found on the Berlin Wall: faces peering out at passersby with weird expressions, words of protest in German and other languages and all sorts of abstract art.
Because Surrealism deals with the workings of the subconscious mind, the art produced by Surrealist artists tends to be strange, thought-provoking and memorable. Most people are familiar with Salvador Dali's melting clocks, but other Surrealists produced art that was equally strange. Rene Magritte painted mermaids that had a fish's head and a woman's legs, women's dresses with their anatomy on the front of the dress and pictures of high heel feet.