I had dealt with these people for several years. In my company, I changed teams several times.

But I still got emails inviting me to internal meetings: they thought? assumed? hoped? ...that I was an internal consultant.

This was pursuant to a larger project and I was on the call for that one and pointed out that I was no longer on the implementation team but was thrilled to be there... because I was. That final / initial deployment resulted in WTFs and I said "woot!" and dropped the call.