I teach technical content to very technically astute people, and nearly every class I lead off with a quiz that says the following:
"SIP stands for Session Initiation Protocol. This is not the same as IP which is short for Internet Protocol. Thus SIP is not IP. At the same time, SDP is short for Session Description Protocol, so we can say that SDP is not SIP. Since RTP is short for Real Time Transport protocol, it goes without saying that RTP is neither SIP not SDP.
Given the above information, what does SIP stand for?"
In a class of otherwise technically savvy (and often I would say very smart people), about half usually get the question wrong. My point: there's blind devotion, and then there's people who just aren't paying attention.