Paint bricks like wads of cash and throw them at people. DOSH DOSH DOSH! Let's do a Killing Floor thing for an expo, I need an excuse to buy a gas mask.
Also, I had fun on the Assassins Creed Revelations Minstrel mission, where Ezio sings.
"Cesare, oh Cesare, a man of great depravity,
believed himself immortal 'till he had a date with gravity!
Made me chuckle.