make an exhibition of oneself
Show off or otherwise embarrass oneself in public, as in When Mike has too much to drink he's apt to make an exhibition of himself. The first recorded use of this term was in Charles Dickens's A Child's History of England (1853).
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.