A man named David Hesson was cycling through British Columbia when he noticed an unusual spider sharing his bike's saddle.

Stopping to admire the arachnid, David films the spider, moving in for a closer look.

And that's when it pounces - and terrifies him.

Check out the viral video here: 

In fairness, we'd probably scream just like that as well...

(H/T: LiveLeak)