If this wasn't on a cop's dash cam, I would never believe someone could be so incredibly stupid...

This is what the Pelham Police (NH) wrote on their Facebook page:

We are always on the lookout for motor vehicle infractions when out on patrol. Some are more obvious than others. This driver almost caused an accident and faces multiple motor vehicle charges. Take a look at this video from MPO Page's dash cam. He was driving a fully marked cruiser.

That's important. What he did, he did in front of a fully marked cruiser: