Just a few things in the account that don't make sense and lead me to believe it's just a made of story (really? a guy with superhuman power? who would have thought... )
Samson was dead strong and killed zillions of them Philistines (who, as an aside, then seemed to vanish from any trace in history).
He did his massacres with a piece of animal bone.
He gave away his secret that it was his hair that gave him his power.
They chopped off his hair and he was easy meat.
Now, if I was a philistine, I would have assigned someone to shave his baldy head every morning like they are probably doing in Guantanamo Cuba. Don't they remember how strong he was? Geez ... it's like catching superman and then throwing away the kryptonite.
In fact, he was such a threat, why keep him alive at all? It's like the villains on James Bond films showing him round the secret base ... "the only way to stop me Mr Bond is to press that red button there".
Now, the key bit is that the story ends with Samson praying for Jehovahs strength to destroy the Philistines in their temple.
If that's where he's supposed to have got it, then why does it go on about his hair starting to grow as if this gave him magical power?
Something smells fishy to me ...