His real downfall, however, was a nasty bit of work called Delilah (another Philistine, ho-hum) who betrayed him for a bit of cash. Nice. The Philistine rulers wanted to know why Samson was so strong (and wouldn't you, what with random blazing vermin running all over your barley? Eh?), and so they employed Delilah to use her considerable feminine guile to get the secret from him. She tried twice, Samson lied twice, Delilah betrayed him twice, lots of Philistines got their heads knocked together. Er, twice. The third time, Samson, not being the sharpest tool in the box, decided to tell her the truth. Erm... Anyway, apparently his strength lay in his locks, so what does the wily Delilah do but shave them off! The scallywag. So, after being weakened, blinded and arrested, Samson is sentenced to spend the rest of his days pushing a big wheel round and round. Nice work if you can get it.
Anyway, that's the end of Sam, right? Wrong. You see, Samson realised the error of his ways and turned to God to get him through the ordeal. So God does the natural thing and makes the Philistines so stupid that they forget to cut his hair when in prison, then when they're all a little tipsy one day, they call for him to laugh at, he pushes the temple pillars over, the whole shebang comes down and Samson does the world a big favour by getting rid of most of the Philistines in one fell swoop. Hurrah!
Samson was remembered not for his weakness but for his strength, which came from God. Even though we succumb to temptation, God can make us strong if we put our trust in Him.
Read more in Judges 14-16