Time for some fill-in-the-blank fun!

Here I'm going to make a statement with a blank space, and it's up to you to fill it with the name of an anime series. So instead of doing this as a poll, which has some limitations (such as each of you would only be able to make one contribution), I'm just going to leave this as a completely open entry which simplifies things greatly.

"The best episode of ____________________ was the one where they piled into a convertible and drove off to Las Vegas for the weekend."

Fire away as many times as you like.