One of my then-friends invited me to her apartment, and the whole house (almost all surfaces, including floor and sofas) had money on them, not coins but actual bills. They were not counterfeit but their business (on the side) was bringing in cash and it was above the allowable deposit limit, so they just kept it at home.
A small child who worked on a construction site (India) and was supporting a family of 4 with his earnings.