The world grieved on Friday upon hearing that beloved actor Leonard Nimoy , most famous for playing Spock on Star Trek , had died. Many took to social media to express their condolences, but the Canadian Design Resource led a call to action, encouraging Canadians to "Spock" their $5 bills. With a pen and a little bit of time, former Canadian Prime Minister Sir Wilfrid Laurier, who is featured on the Canadian $5 bill, can pass as a pretty convincing Spock.