It's a must-visit for fans. Credit: AaronP/Bauer-Griffin/Getty ImagesRegardless of where you live in the U.S., I’d bet an Animal Style Double-Double that you’re familiar with In-N-Out. Even if you aren’t lucky enough to live near one of the infamous fast food burger joints, odds are that you’ve heard of the West Coast chain’s delectably simple menu of cheeseburgers, hamburgers, french fries, and milkshakes—plus a few secret menu hacks here and t…