Dimension of Miracles | Robert Sheckley

This madcap cosmic farce relates the adventures of the hapless human Carmody, as he attempts to make his way home to Earth after winning the grand prize in the Intergalactic Sweepstake, encountering parallel worlds, incompetent bureaucrats and talking dinosaurs on the way.'The greatest entertainer ever produced by science fiction ... a feast of wit and intelligence' J. G. Ballard