<prompt> Human: I seen this interesting post on Facebook where every time you get a 5 dollar bill you stash it away and save it up until the end of the year. Has anyone tried this? If so, how did it go? I started at the beginning of the year and have 25 so far but I rarely carry cash on me. Excited to see how it will look by the end of the year.  <response>: I did this with 1 bills for about 13-15 months. Dont know the exact period. At the end when I cashed in, about 3 months ago, I had over 1500. It was such an awesome feeling. Note: I always use cash, card is only used for online purchases. 