Some things are a tedious pain in the butt. For instance, running out of prescription allergy medicine and having to go wait in line to renew it instead of doing it online or by mail because you threw away the box with the prescription number. Not having that magic number that is the key to resolving a situation can make a chore seem more than twice as big and could delay you for days.
This situation can be avoided.
In your contacts on your phone and/or in an email to yourself in a web-based email program like Gmail, note those sort of numbers that it would save you a ton of time to have later.
– prescription numbers
– your rental or homeowners insurance account number
– the phone number of an out-of-area friend or relation who could help you in case of a natural disaster
– your sizes and/or measurements (and those for others you often buy clothes for)
– membership numbers for things like the video rental shop, gym, discount cards for stores, frequent flyer clubs, etc. (and if they're in your phone, you don't have to carry all the dang cards around with you all the time)
– your landlord's and neighbor's phone number
Things you probably shouldn't list so as not to risk identity theft:
– social security number
– credit card numbers (though the contact numbers for lost cards are useful)