Warcraft 3, probably. It had a huge influence on RTS games as well as showing off how powerful modding can truly be. Other PC games allowed modding but WC3, in my opinion, embraced it.

Don't press the red button.

Yet they went with a crappy one on the PS Vita.

This is clearly an homage to Monty Python and the Holy Grail.

Christina Ricci was cosplaying Elizabeth decades ago!