Andrew saw a shooting video game called "Werewolf Attack" with what appeared to be a silver pistol connected to the machine. He put some credit in and started playing.
The game was set in a dark, spooky-looking wood where packs of werewolves kept lunging at the screen. The object was to shoot them with silver bullets before they could reach you. Andrew had played shoot-ups several times before and was quite experienced, but then he narrowly missed one which was very near. With a final lunge, his jaws filled the screen and the words GAME OVER appered on screen.
Andrew felt a small shock from the pistol he was holding. Dropping it, he looked at his hand. There were several hairs growing on the palm, and the fleshy bits were hardening. The same thing was happening to his fingertips, and his nails were growing and sharpening. It was the same with the other hand, and his feet seemed to be changing too - they were growing in his trainers, which grew tighter and tighter until they split open, revealing large footpaws with clawed toenails.
Feeling himself getting hairy, he raced to the bathroom and saw that not only had he grown a lot of hair on his face (and all over his body too), he had also grown a muzzle, pointed ears and sharp fangs.
Andrew had become a werewolf!