Well, chiropodists like jokes. But opticians like them.
Disclaimer: I don't know how well this joke will work in English. What's yellow and lies in a pond? An excevator. You don't think this is funny? Neither does the operator.
Nah, I'm still working on it.
An accountant without the sense of humour.
Because it's inefficient!
A rem job
Because they both "practice" their professions.
Because he didn't C#