grandstand play

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun idiomatic, sports A successful play or other manoeuvre during a sporting competition in which one or more players shows off unnecessarily in order to entertain or impress the spectators.
• noun idiomatic, by extension An action or stratagem that is excessively dramatic or sensational and that is intended to appeal to members of the public or to a particular audience.