Elwood Hutt, Jr. of Salisbury, Maryland tells Action News he was driving the truck and just took a corner too fast.
His plans were to sell the melons to vendors throughout the city, but instead, he created quite a spectacle.
"It's perfect Snapchat material, maybe put it on the Gram," passerby Paul Aldana of New York City said.
Not all hope was lost as some bought surviving watermelons from Hull.
Others let their kids eat some.
"Some are still whole. I assume they're not going to resell them," Lisa Broder of Center City said.
Some of the local carriage horses who give historic tours got in on the watermelon clean up - by eating them, of course.
Mickey, described as a sweet horse, was especially interested in taking part in the cleanup.
"Mickey has never met a fruit that he didn't like," Lisa Saier of Abington said.
Philadelphia police shut down a few lanes of 6th Street for the cleanup.
Despite providing some brief entertainment, everyone felt bad for the owner and the poor, poor watermelon.
All of this had Yvonne Adonis of Collingdale craving her own watermelon at home.
"I'm going home, I am going to put the watermelon in my refrigerator, cool it up, and I'm going to eat it," Adonis said.
Hutt was issued a citation. He says he lost about $250 in watermelons.
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