Cashier: "Ma'am, kulang po ng Php 1,000" (Ma'am, you're Php 1,000 short.)
Mom: "15 yan miss." (I gave you 15 thousand.)
Cashier: "Ay,sorry po. Nahulog lang po pala sa may paa ko." (Oh I'm sorry, the bill fell on the floor.)
If my mom wasn't sure of how much money she carried that day, she could've given the cashier another thousand. Of course we're not sure if the cashier did that on purpose or if it was an honest mistake. But still, it's a nice strategy since the customers can't really see what's under the counter. Just be careful and always count your money.