Can A Water Bottle Left In Your Car Start A Fire?

A friend told me about a video of a water bottle causing the interior of a car to catch fire, could that really happen? I leave water bottles on my passenger seat all the time, so I looked into it and was surprised by what I found.

The sun shining directly through a full bottle of water can cause the same effect as the sun shining through a magnifying glass to set a leaf on fire. After watching this video it made perfect sense to me!

Stash those water bottles!