Commision Sales. I'm at a department store, selling kitchen applainces. Most days are fairly slow, so you can chat with your buddies, go online, hide from the supervisors and get on your cell, etc. Once customers come in, then it's time for business.
Ok, so if you over do it on the slacking off, you don't get paid much. So remember the parts of the day when the most customers will be in your dept., and just kick it 'til then
On the other hand, you can go into "work-holic" mode, and get these HUGE pay checks. This one 19 year old single mom made $2000 in a month selling vacummes and matteress, part-time!