Yes, me too. It's not just because they slowly and excruciatingly try to nail the songs while you, having already nailed the songs, are obliged to stand there waiting and watching with a face like a pair of old tits, it's the fact that they just couldn't be bothered and instead spent their time drinking / playing video games / watching TV / rummaging in their pants* instead. Nothing is more likely to raise the temperature of my urine to 100 degrees Celsius.
*delete accordingly.