The Training Day actor became quite attached to his fake teeth, which were fitted to his real teeth for the film - and he was allowed to take them home.
His daughter also fell in love with the pearly whites, wore them for Halloween and then lost them.
Hawke says, "I loved my fangs because they were fitted to my real teeth and I could glue them on and they were really cool for parties.
"My daughter borrowed them for Halloween and she took them off and accidentally dropped them down the sink, so they're gone forever. They were pearl and they were so cool."