Can you use pedals on an acoustic guitar?

This guy shows you how a handful of cool pedals truly makes your acoustic guitar make sounds it might not be used to.

These are the pedals he will be testing:

Wah pedal
Heavy distortion
Fuzz / Octave
‘Delay pedal’?
Another delay… on top of the first delay

Watch at 3:35 how the Fuzz/Octavia pedal makes his acoustic guitar squeal.