I think Filipina's have a cracking sense of humour, some of the jokes I've heard were VERY funny!
I think Filipino's worry they might be offending somebody, this is why they tell you it's a joke I think..
It seems to me that Filipinos like the incongruous jokes the best...
Like this one:
A man walks into a hotel reception...he is shocked by a notice on the wall and says to the receptionist "That's strange! It says 'Be In Bed Before I am'.....Why should I be in bed before you are!?"
Receptionist says "Excuse me sir, it says 'Be In Bed Before 1 .a.m." (One a.m.)
I'm so fond of jokes I'm starting to note which "type" of joke people like!