S&P 500 end of day pump and dump?

Market tracking along for a normal corrective wave, and then in the last 10 minutes a massive surge. A buying spike that fits no model. There was something similar to it a while back in a similar corrective wave that was quickly followed by a huge sell off.

Is the market just completely bonkers and head to 4000 this month or is this a good old fashion "pump and dump"?

Thoughts?