We’ve all been there. Having a perfectly good burger in our hands and having to ruin it with a considerable amount of ketchup from the bottle.

While we’ve kind of accepted it and have come up with our own methods to getting ketchup out of the bottle, there’s actually a scientific reason why dealing with ketchup can be such a pain.

According to TED-Ed, ketchup doesn’t act like a normal liquid. Instead, its thickness is constantly changing, depending on how much force we put on it.

In the video below, George Zaidan describes the physics behind this frustrating er, phenomenon. Check out the full-science below.

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