How to get that star-burst effect?

Here's a tip I learned from my first photography class. If you are shooting night scene and you want to get that "star burst" effect from the lights, set your aperture to f/22. I remember the instructor showed us a photo she took in Ireland, outside a tavern at night. The effect from the street lights were amazing.

The photo below was taken with f/22, I thought the effect came out pretty good.