Go to google maps and search for a business. A funny business like a whore house or the local headquarters for the party opposite your buddy's.
Click "call" on the desired listing and type in your buddy's phone number and then click connect.
Your buddy will get called. When he/she picks up the other end will ring at the business and hilarity ensues. The only down side is that you can't listen in.
I give it a week before Google has to pull the feature. Sigh.