Before freaking out that you forgot your user/password and trying a hundred different combinations, check if the keyboard isn't set to German (especially if said password has a Z in it). #LFMF
Remember, guests might want to use your wifi, so don't name it an explicit reference to a specific sexual fetish you and your partner share.
Be careful when checking out computers at Best Buy, don't forget to logout of your facebook or you may just end up a member of the nazi party, having your wall covered in jokes and pr0n, ect.
It's never okay to tell anyone your Facebook password, even your best friends. They will have no problem violating your trust, and you will find several wildly inappropriate status updates the next day. #LFMF