By Monday morning, the page had received over half a million dollars.
He elaborated on what was going through his head at that time in an interview with MSNBC Monday.
So maybe we can raise 2,500 bucks.

Credit: MSNBC
Within about 20 minutes, Penn said, they raised the goal of $2,500.
As of noon ET Monday, more than $550,000 has been donated.
And I thought that was such a beautiful thing.
Penns CrowdRise page is still accepting donationshere.
See a clip from his MSNBC interview below.