Do a Sandro

To shade two presidential candidates on the ballot, rendering the vote invalid.

Derived from the infamous event where Ferdinand Alexander "Sandro" Marcos, grandson of the dictator-tyrant Ferdinand Marcos, shaded two presidents on his ballot, making his vote for president null and void.

M: It would be psychological torture for DDS and BBM supporters to choose between Sara and Marcos Jr.
J: They should just do a Sandro and shade both. Those candidates are useless anyway.