About this scene
Pharmacy aisle, mid-afternoon, two other shoppers visible at the far end. She's chubby, mid-thirties, in a sweater and leggings, and she has been on her phone texting for the entire time the camera has been running. The flash happens three feet behind her. She doesn't look up. The cumshot lands on the metal shelf next to her thigh, splashes onto the price tag rail, and drips. She still doesn't look up. She finishes her text, hits send, and walks out of frame still typing.
What to watch for
The phone is the whole gag. Watch her thumbs. They never stop moving. Not when the flash starts, not when the cumshot lands, not when the dripping is audible six inches from her hip. There's exactly one frame where her left thumb pauses and her eyes flick up half an inch. Then they go right back down. She knew. She just decided it wasn't worth losing her place in the conversation. That's the joke and that's the whole video.