The merry pranksters behind the screen will do anything for a laugh, and have reaped them - audience laughs and box-office bucks - by the billions. The DreamWorks ogres, zoo animals, cavemen, monsters and aliens are masters of shtick, avid custodians of pop-cultural references. Shrek, the first Hollywood-bred animated feature to have played in Cannes’s official selection since Disney’s Peter Pan in 1953, set the standard for a Katzenberg cartoon: snappy, zippy vaudeville.