If you need to smell milk twice, it’s most likely spoiled.

But, let’s be honest, most of us have taken a chance on a dash of milk we weren’t really sure about—though we’re not sure we’d do it again after witnessing the consequences of drinking spoiled dairy.

If you’re unfamiliar with Zack D. Films, he is a YouTuber who creates instructional simulations about a variety of intriguing events.

In one video, he explains why sipping off milk makes you ill and what occurs after it reaches your digestive tract.

It’s probably wise to pause your dinner for this one.

“When you drink expired milk, it will make its way into your stomach and cause some nasty reactions,” according to the instructional video.

“The acid bacteria in milk generate a sour taste and an unpleasant odor. Once these bacteria grow in your gut, your stomach alerts your brain to eliminate them.

“Your body will do anything it can to get rid of the toxins, including diarrhea, vomiting, and intense abdominal pain.”

People were appalled after seeing the video, with one saying, “Thanks for showing this while I was eating.”

Another said, “I find Zack’s animations traumatizing, but I still come back to watch them.”

“This is why we should always check the expiration date,” a third person stated.

A fourth person stated, “Even looking at expired milk makes my stomach feel nasty!”

So, how can you determine if milk is contaminated?

According to Medical News Today, spoiled milk has a foul odor that becomes more intense over time.

“A yellowy color, crusts around the edges, and lumps in the milk also indicate that it is off,” the researchers add.

“Drinking small amounts of spoiled milk may cause no symptoms or minimal symptoms that usually resolve on their own.” For example, it may induce stomach discomfort, nausea, diarrhea, or vomiting. Spoiled milk is unlikely to create long-term issues.

The way you store milk at home might help it stay fresher for longer.

For example, store the milk in the fridge as soon as you get it home; ensure that the lid is always properly secured on the bottle; keep hot foods away from the milk in the fridge; avoid leaving the milk out of the fridge for long periods of time; and keep the temperature of your refrigerator cool enough.