Sam Rockwell‘s castmates better stay on their toes. The actor-director told us, “It has been a dream of mine since I saw ‘Star Trek’ and ‘Star Wars’ as a young boy to Taser some one on film.” And his dream does indeed come true in the charmingly titled short film “F – – K,” which premiered last night at the Tribeca Film Fes tival. Rockwell stars with his actress girlfriend Leslie Bibb and “Law & Order” star Mariska Hargitay.