Despite the warnings plastered all over the web about why you should use one, I constantly see sticky notes with passwords stuck to monitors, under desks and unprotected spreadsheets with lists of websites and all the login information needed to access the accounts.
It never ceases to amaze me how often I still notice people (and business clients) that don't employ the use of a Password Manager. Update: Part-2 of this article is now available by clicking this link.