LOVE Jakey’s smile! Jake Gyllenhaal appeared on David Letterman last night promoting his movie Prince of Persia:  Sands of Time where he discussed a visit to Russia and how he had read it was inappropriate to smile or laugh as the Russian people would think you were either stupid or crazy.

He then shares his vacation photos of the trip with David.  It really is quite funny.

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Photos:  HRC/WENN