A close coworker of mine has developed an obsession with morse code and has decided to use it constantly with me. Whilst I find it pretty cool, it's really distracting and I'm finding it hard to concentrate because of it.
This has been happening during meetings, via sms and even in person by tapping on the desk using a pen or fingernail.
I'd like to find a way to deal with this whilst still being respectful, what would be a good way to politely tell him and make him understand, without making him sad/mad/embarrassed or damaging our relationship?