A broken lock will always work when demonstrated for the locksmith.
The lock will stop working the minute the locksmith leaves.
The probability of an auto lockout varies directly with the intensity of the rain.
The length of time it take to open any vehicle varies directly with the intensity of the rain.
The length of time it take to open a vehicle or pick a lock varies directly with the number of on-lookers making fun of how long it takes you.
The length of time it take to open a vehicle or pick a lock varies directly with the number of television and movie characters your customer claims can do it in only a few seconds. {There is a dispute as to whether it actually takes longer or whether time just seams to drag when certain customers are around}.
The probability of having someone closing a safe and spinning the dial while you have the back of the lock off will vary directly with the square of the number of people you tell not to touch the safe while you get something out of the truck.
The probability of having someone close a safe and spinning the dial while you have the back of the lock off will vary directly with the square of the number of re-lockers that will be tripped.
The more elaborate the precautions you take the more likely they are to close a safe and spin the dial while you have the back of the lock off. {Nothing is fool-proof because fools are too ingenuous}.
They lock will always be the wrong hand and not field reversible when the job is more than 1/2 hour travel.
Any lock finish or style that you have with you will not match the rest of the hardware in the building. The harder it is to obtain matching hardware, the more the customer will insist on an exact match.
If you have an exact match the customer will say " Matching isn't important, don't you have anything cheaper?"
When a customer has a large number of specialty locks, that lock will require very expensive service and pin kits.
When you buy the kits, you only get to use them one time, or you find that something you already have can be used instead.
When you don't buy the kits, nothing else that you have will work instead, and you will have constant problems that would have been avoided by buying the kits.
By the time you finally buy the kits your lost time will exceed the cost of the kits by ten fold. Then your customer will go elsewhere.
The harder you try to get to a call quickly, the more other locksmiths will beat you to it and the less likely you are to get paid for coming out.
The more difficult the customer, the more locksmiths he or she calls to come out.
The more people customer call, the less likely you are to get paid. {Major a-holes call every locksmith for a hundred miles radius}.
They only pay the first to show up and complain about the price they have to pay, even though they were quoted that price before they told you to come.
