Looking on the internet deeply has found these results:

I fell off the boat is the most popular phrase on the web.

I fell from the boat 127 results on the web	I fell off the boat 189,800 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
force trauma, which could have happened when he fell off the boat. That night I fell asleep on the boat, I had a dream. No, the wife of the guy who fell off the boat, got sliced up by the propeller. Billy claimed that the two of them were drinking and his wife accidentally fell off of the boat. My best guess, the life vest came off when he fell out of the boat. There's evidence of blunt The exact time Monica's dad fell off the boat in new York harbor, She fell in the boat, hit her head.	There's evidence of blunt She... She slipped and fell off the boat? He fell off the fishing boat and drowned. force trauma, which could have happened when he fell off the boat. The exact time Monica's dad fell off the boat in new York harbor, No, the wife of the guy who fell off the boat, got sliced up by the propeller. I fell off the boat. He fell off the fishing boat and drowned.

I fell from the boat

127 results on the web

I fell off the boat

189,800 results on the web

More popular!

force trauma, which could have happened when he fell off the boat.
That night I fell asleep on the boat, I had a dream.
No, the wife of the guy who fell off the boat, got sliced up by the propeller.
Billy claimed that the two of them were drinking and his wife accidentally fell off of the boat.
My best guess, the life vest came off when he fell out of the boat.
There's evidence of blunt
The exact time Monica's dad fell off the boat in new York harbor,
She fell in the boat, hit her head.

There's evidence of blunt
She... She slipped and fell off the boat?
He fell off the fishing boat and drowned.
force trauma, which could have happened when he fell off the boat.
The exact time Monica's dad fell off the boat in new York harbor,
No, the wife of the guy who fell off the boat, got sliced up by the propeller.
I fell off the boat.
He fell off the fishing boat and drowned.