BUGSY MALONE.
Factors:
It stars two of the top teen actors of 1970s America (Jody Foster & Scott Baio).
An entire cast of pre-teens and teens playing adults: mostly 20s era mobsters and molls.
Foot peddle cars.
Automatic weapons that shoot pies.
Said pies KILL.
Paul Williams' score.
Every male character lip synchs to Paul Williams, and thus SOUND like Paul Williams.
Epic in its costumes and intricate set design.
It's like COTTON CLUB meets JAMES AT 15.
So bad it's good.