I was once asked to procure a food processor (IIRC) on my way through AMS so a friend could carry it back to Teheran on his next trip. I balked when he later asked me bring home a vacuum cleaner from Selfriges...
Another friend asked for a refill for a specific brand and type of pen (found it at Harrod's ) and later wanted me to scour south London for a specific Thule accessory (but I do know when to say no...).