Christanford“2. I think there is not much to understand for this one. Just that we are reading a joke and the bartender asks if this is a joke. (Maybe I didn't get this either!)
5. I don't get this one either 
”
A blonde, a brunette, a red-head, a priest, a nun, an irishman and a talking pig walk into bar.
The bartender looks at them and says, "Is this some kind of a joke?!"
Lots of popular jokes start with someone walking into a bar. Also, there are often some kinds of stereotypes in jokes: Irish people always drink too much, blond girls are not intelligent, lots of jokes are about animals, priests, rednecks, etc. So as soon as the bartender notices that those particular kinds of "stereotypical" people walked in together, what can he think? It seems so ridiculous that he knows it must be a joke. LOL
A boy walks in to a bathroom to do his
business. He lifts open the seat and finds a small Indian standing in
the water. "WOAH! Jeez man, how long have you been in there?!", the boy
exclaimed. The Indian replied, "For many moons."
The way I take it, there's an American Indian (a Native American, you know) who is inside a toilet.
It seems reasonable to think of time as "moons": it might be a month, or a year, I'm not sure how it could be used. From Merriam Webster: one complete moon cycle consisting of four phases - an indefinite usually extended period of time.
I knew that the verb "to moon" can also mean "to show your buttocks as a joke or a way to insult someone".
So maybe now you can figure out why a small American Indian inside a toilet has been there for many moons.
I might come up with something else funny soon.