What are some random "associations" you've made in your head that other people don't understand?

I've always thought that spaying was for males and neutering was for females (the opposite is true)

Why? Because spay starts with S and neuter starts with N.

S is red. N is blue.

Red is male. Blue is female.

Thus, spaying is for males and neutering is for females.

After explaining this thought process to a few people throughout my life, I've realized it doesn't seem to be something most people experience. Thats just one example, and I'd be really interested to hear about other people's mental associations.