Do you remember Michael Stone, who stormed Stormont in November 2006? It’s alleged that he

…planned to slit the throats of Sinn Féin president Gerry Adams and Martin McGuinness inside the Northern Ireland Assembly

Well:

Stone, 53, has denied any intention to harm anyone at Stormont and has claimed his attack was performance art.

[RTE.IE] Stone planned to stab Adams & McGuinness

More attempted murder: Dublin Improv: Slow motion egg and spoon race down Henry Street.
[Wikipedia] Performance Art.

Update: Superhero Green Ink points out in a comment that he anticipated this way back when it happened!