The Rock and the Moss

"'Sure, I'm the secretly tough one everyone overlooks because I seem ordinary and boring, but you're too pretty to be lichen.' 'I'm many things, Anna, but I assure you I'm not pretty.' 'You're more like moss,' she declares, ignoring the assessment." Hiccup's in an embarrassing predicament. His best friend (who he's totally not crushing on) is deadset on making it better.