question these questions...

For the past few days random questions have been popping up in my head. i really dont know the answers to them & it really makes me think...

first question: if the impossible is possible, does that mean the impossible was never impossible to begin with?
second question: if someone tells a lie but no one knows its a lie,  is it a lie?
third question (im sure most people have heard this before): if a tree falls in a forest and no one is around to hear it, did it really make a noise?
fourth question: why do banks charge a fee of insufficient funds when they know there is not enough?
fifth question: whats beyond the universe?
sixth question: if the unexpected is expected does that make still make the unexpected unexpected?

if you have answers and/or explanations please SHARE! 
I think these are called philosophical questions...? why not call them thought exercises.