There is a reason why most In-N-Out burgers have palm trees forming an X outside their buildings!

Almost all In-N-Out Burger locations has a couple of crossed palm trees located on their property.

This is an allusion to founder Harry Snyder's favorite movie: Stanley Kramer's It's a Mad, Mad, Mad, Mad World.

In the movie, characters look for a hidden treasure and find it under "the big W" made by four palm trees, with the middle two forming an "X" according to a story in the Gilroy Dispatch.

Also, some In-N-Out Burger products have a Bible verse discreetly referenced on them. They do not include the complete verse. This was started sometime in the 1980s by Rich Snyder, one of Harry's sons.

In-N-Out burgers surely know how to both satisfy and entertain it's costumers!

(Source)