In a previous life I worked with a professional lift truck mechanic. I watched him change a tube of grease one time, and commented on how much neater he was at that than I am. He started laughing, and told me that the last time somebody told him that, he was changing a tube on the customer's carpeted showroom floor (no, I don't remember why he was doing it there). The owner told him that if he (the customer) was changing it, he'd have grease all over the place. Bill shrugged his shoulders, said something about the benefit of experience, just as the rod came loose from the back of the gun, and shot grease all over the customer's carpet. Fortunately, the customer laughed about it, and blamed himself for distracting Bill.