Playing with Fonts

Here's one way to do it.
     \documentstyle[12pt]{article}
     \begin{document}

     ``It's \Large \bf very \normalsize \rm provoking,'' 
     Humpty Dumpty said after a long silence, looking 
     away from Alice as he spoke, ``\small to be 
     called an \em egg \rm -- \normalsize \bf  very\rm!''

     \end{document}