I just walked into my closet today and found a few pots filled with pennies... I figured out that paying something with pennies would be a jerk move, so where can I exchange them for a few dollar bills?

At any bank. They will probably want the pennies rolled first. Or you can use one of those cash machines that turn coins into bills; most grocery stores have them.

A bank will NOT count pennies for you. They will give you rolls and you can count them. The bank will check them (by weighing them) and will give you bank notes.

Go to a bank with a coinstar machine. If you have an account with them they will not charge you a fee. If you do not have an account with them they will charge you a fee probably 10%

go to a bank they will count the pennies and give you dollar bills