Hamlet Act 5

I have a question. Maybe I just didn't understand what was being said here... but what did Hamlet mean when he said, "Here hung those lips that I have kissed I know not how oft.".. (Act 5, Scene 1) when they were talking about the jester. Did Hamlet just say how he used to kiss the jester? ........

I also thought it was pretty interesting how flowers were brought up in this act again. Laertes says, "And from her fair and unpolluted flesh May violets spring!" So I'm assuming that violet flowers in this case represent virginity and purity. Then the Queen mentions how Ophelia's bed should have been covered with flowers, not her grave. So basically, the flowers should have represented a wedding, but instead, they represented a funeral.

I have another question. Right before when Hamlet and Laerter start fighting each other, why did Hamlet jump in Ophelia's grave? I don't get it. It was really random and seemed unnecessary. Is it supposed to emphasize his "madness?" Then later on Hamlet says:
"Dost thou come here to whine,
To outface me with leaping in her grave?
Be buried quick with her?—and so will I."

So this means that it was supposed to show who has more love for Ophelia? Right?

I thought when Osric came in, it was funny with that whole "hat" issue. Hamlet's just goofy.

Now for the main question that I've been meaning to answer, whether if Horatio will be leaving anything out in the story he tells (of Hamlet) or not... I think he'll be leaving some things out, but not all. It's true that he wasn't there when the ghost of Hamlet's father was telling Hamlet to avenge his death. But later on, Hamlet did tell Horatio that Claudius poisoned his father. During the "play," Horatio might not have been in on the trap that Hamlet had set for Claudius, but I'm pretty sure, when going back to tell people the story, the idea would've "clicked" in his head. I mean, didn't the King make a big scene and leave? I overall think that it was the right decision to make Horatio the "story-teller" at the end. He had no drama with any of the people in the court, and that way, he can tell the story like it is without actually being part of it. He is blood free, and isn't guilty of lying or hiding the truth. Unlike Guild. and Rosen., he wasn't snooping around and sucking up to the King. He was Hamlet's FRIEND, and therefore, he seems fit to tell Hamlet's life's story as well.