I once started a job where the contract contained a very weird clause: I wouldn’t be able to use any programming-related knowledge I gained at the job for my fu

I once started a job where the contract contained a very weird clause: I wouldn’t be able to use any programming-related knowledge I gained at the job for my future jobs. Obviously that‘s not enforceable, but it led to a ridiculous discussion where I tried to explain to them that if previous employers did this, I could only use the knowledge I gained before being employed - effectively programming like during highschool. They agreed in the end that I should be allowed to transfer knowledge and the clause was removed.