Every Holga is unique. Mine has a light leak on its upper right corner. I've seen some Holga pictures with multiple light leaks or none at all.
To enforce the light leak I put the light on the camera instead of the subject and made an exposure of more than 20 secs. The only light the scene received was reflected from the camera and the walls to the left. It somehow reminds me of this poem.
This one goes to Ilke for introducing me to the wonderful world of polaroids.