Your best friend is your soulmate, sister by heart, and partner in crime. You can hardly find anyone like her who sit with you through season after season of "Friends", give you some make-it-or-break-it love advice, or lend you a shoulder to cry one when this advice doesn't work. Having true friends is a privilege and one of life greatest's gifts. So when shopping for best friend Christmas gifts or good birthday gifts, remember to choose a best friend birthday present that is as unique and special as your BFF! Custom coffee mugs for 2 best friends are definitely on the list of best birthday present ideas this year!