It's not about getting it! Some jokes are not funny!
For example, I agree with you about Hasib's Joke - there should have been a reference to baseball, otherwise it's not funny.
About Bush, Political jokes might not be for you! If you compare that Joke to Princess Diana incidence.. it's actually sad!
As for Rajputro's comment - Only he knows what apples and bees meant. I never seen a bee on an apple! I saw a cockroach though!