Being high on drugs can really impair your judgement. And although I can't say for certain that this woman is on drugs, I'm going to go out out a limb and assume she is.
Because who in their right mind shows up at a convenience store with a fake credit card, a fake debit card and a fake cell phone and tries to buy some snacks?
The woman keeps trying to swipe the cards even though they're clearly plastic cards made for kids or something. The dude filming tell her he'll buy the stuff for her if she dials his number. But turns out her phone is fake too.
Dude has had enough at this point and tells her to leave. SMH.