Observation about Sheldon's "You're in My Spot"

I just watched the fifth season episode again when Howard is given Sheldon's parking space. He didn't even have a car, but Sheldon didn't want anyone in "my spot!"

Of course his spot on the couch is well known. But he also pulled the "my spot" thing when they went to Antarctica. He did it again when the judge threw him in jail for contempt (the speeding ticket episode). He told someone in the jail cell "you're in my spot".

But I noticed that he had no spot in the cafeteria. They usually sat at the same table. But Sheldon sometimes sat on the right. Other times he sat on the left. At the Cheesecake Factory he was usually on the left side of the booth. In the Chinese restaurant, he sat on the right. I mean left and right from the audience's perspective.

Funny when he ate out, he had no favorite spot.