I can't help it.
When showing off my speakers, I always save it for last because even as good as some of the other material I played was, everyone gets blown away again when this comes on.
I think the sound of unaccompanied guitars by themselves have something to do with it. People seem to be able to naturally appreciate stringed instrument sound quicker than many other types. At least that's my personal observation on both myself and others.
I'm Riffing. People usually stop me when I'm riffing. Or carry on without me. That's also an option.