I am Beowulf! - A cocky, overused line that people use when they think they'

A cocky, overused line that people use when they think they're cool but they're not.

'I am Beowulf!' he said, even though he didn't know what Beowulf was.

'I am Beowulf!' she said, because she had no friends.

'I am Beowulf!' he said, because he was tired of being mocked.