New York, Dec 18 : `Top Gun' star Tom Cruise along with the cast of the movie `Valkyrie' have revealed that they lifted their mood on the set of the anti-Hitler film by abusing a bust of the Fuhrer.

"The more grim the tale, the more fun you have on the set, otherwise you go crazy," the New York Daily News quoted Bill Nighy, who plays Gen. Friedrich Olbricht, as telling at the flick''s NYC premiere night.

"If you are in a Nazi uniform, you''re tempted to do stupid and disgusting things in it, to dishonour [Nazis] as much as you can.

"I would spit in his eye, and everybody would give him the middle finger and a few choice words as they walked by," he stated.

Co-star Kenneth Branagh recounted an old English ditty the cast sang to lighten the mood.

"I shan''t repeat it, but it was based around the fact that Hitler only had one testicle," Branagh added. (ANI)