He can pick up some pocket money by going to lunch with a group from his customer's office (going Dutch, of course). At the end of the meal, he offers to collect the money and settle the bill so everyone else can get back to the office. He then pockets the money, including the tip, charges the lunch to his company credit card, stiffs the wait staff and gets reimbursed by his company for taking the clients to lunch. Well, it's just a thought.