This one bugs me:
Can I ask you a question - which usually prefaces a request for information that is none of their business or as a ruse to making a snarky comment.
"Can I" - I don't know; can you? Do you have the power of speech? Are you asking via text, email, or semaphore
"May I" - This is seeking permission to ask me a question. Depending who you are, I might not give it to you!
There are some days at the museum where we have spent the day answering either off-the-wall questions such as "why did they build this building to look so old" (It was built over 600 years ago!) or sidestepping questions about our personal lives. (I may be getting old, but I am not one of the exhibits!).
HettyB