Your Favorite Internship Experience?

So, I was thinking - it'd be awesometo hear some of you guys who have successfully landed positions on wall street's experiences.

What is the best internship you've ever had? What made it such a worthwhile experience? Did you secure a return offer? Did you decide the job wasn't for you and you transitioned into something else? What did you hate the most?

Any and all responses are game, this could be fun or very informing. +SB