Opposable thumbs are overrated apparently.

A cat owner named Kristian Svenson posted the viral video (below) after being amazed that his cat, Mulder, kept going in and out of closed doors at his Colorado home.

Not even some makeshift obstructions could stop Mulder.

Svenson told the Daily Mail that he first saw Mulder pull this off when he was only five months old.

"I was cooking and I needed him to stop jumping on the counter for a couple minutes, so I tossed him into the bathroom and closed the door. Seconds later, he was out ... and I tossed him back in. This was something he had never done previously," said Svenson.

Check it out below: