I once did this. I (Peter) had pclark@adroll and a co-founder of the 750 ish person company I worked at had peter@adroll. Other Peter was widely known as PK.

I jokingly emailed IT and asked to have P(eterclar)K@adroll and to my surprise they gave it to me. They even asked me if I thought it would be confusing for proper PK and I feigned confusion.

I promptly got a lot of email for proper PK and since he was co-founder, CFO and board member I decided this wasn’t a funny prank.