How bad is it? Only the title's good. Worthless drivel.
Should you see it? No.
This is one of those low-budget films Troma bought, retitled and released. Two brothers take a large learning-disabled man from a camp to Manhattan for fun, which leads to vomiting in a fancy restaurant, ruining a wedding, lots of fart jokes, getting shot in a phone booth, being institutionalized and then being broken out by helicopter. Joan Allen appears, between her roles in "Manhunter" and "Peggy Sue Got Married" and the soundtrack is by the excellent Leo Kottke. The film is dull, pointless and misleading, as it tries to be heartwarming when one expects a romp.