Singarounds aren't the place to be involving audiences - as singers themselves they should already be involved. Of course if you're pissed enough at the end of a good night & the crack's* going canny then a bit of showboating don't hurt! Floor spots are slightly different, but even in performances I find too much 'involvement' really gets in the way of a song. I recently saw Michael Hurley - he played for two hours as if the audience weren't there at all. Bliss!

* Note : CRACK not CRAIC. I am a Tynesider, not a habitue of 90s Irish theme pubs.