Sonic punches down a door

'We've arrived,' said the hedgehog, 'and to prove it, we're here. Do you think it would be polite to knock?'
'Probably,' Tails said dubiously. Sonic raised one fist high above his head and brought it crashing down on the door. With a crunch it flew backwards and landed with a slam in the middle of the room beyond.

Chapter 5, Page 119