Yes, the Young British Artists are at it again. This year’s four finalists include abandoned supermarket checkouts with leftover food and a mannequin on a toilet (Cathy Wilkes), a lecture on such modern icons as Wile E. Coyote and Homer Simpson (Mark Leckey), a collage made up of two other artists’ work (Goshka Macuga) and video of a woman smashing crockery (Runa Islam).