Many restaurants use distinctive trademarks to make them stand out from their competitors. In-N-Out Burger, for example, has two crossed palm trees in almost every location, which people have hypothesized refers to everything from the restaurant’s California roots to the connection between the restaurant’s employees and customers.
However, the crossed palm trees are actually in reference to one of the favorite films of founder Harry Snyder — "It's a Mad, Mad, Mad, Mad, World." The 1963 Stanley Kramer comedy, which features an all-star cast of comedians, sees a gaggle of motorists searching for treasure hidden under a “big W.”
In the film, it is ultimately revealed that the “big W” is literal, as four palm trees form the shape of the letter. As a tribute to the movie, Snyder had the palm trees crossed in the middle to form a distinctive “W,” marking the spot where his "treasure" would stand.