You are not imagining the Conga. I was part of it.
Not too sure about Ronnie heading the ball out of the goalkeepers hands though. I thought that the goalie tried to bounce the ball in front of Ronnie and it didn?t bounce because of the mud so Ronnie duly obliged 🤣. It was a long time ago though and my brain is nearly 72 years old so I could be wrong.