Yes, how many times can you think of when the audience has been audibly booing at the ESC? Russia 2010 with "Lost and Forgotten" is one example i can think of, though it wasn't as audible as i remember it, they definitely booed every time Russia got a point during the voting
The other prime example was of course Dustin the Turkey for Ireland in 2008, and deservedly so, not just because it was totally unlistenable crap but it was an outright insult to the whole contest:
And apparently Iceland 2006 was booed too, though i hardly remember it:
The other prime example was of course Dustin the Turkey for Ireland in 2008, and deservedly so, not just because it was totally unlistenable crap but it was an outright insult to the whole contest:
And apparently Iceland 2006 was booed too, though i hardly remember it: