Last year, I wrote, in anticipation of birkat hachamah on Erev Pesach: "Say the blessing over the sun, and then take out a magnifying glass and use it to burn our chameitz? Anything is possible!"
Then today, I got an email from Hazon announcing a birkat hachamah event at the JCC in Manhattan, and the description concludes: "As a finale, technology and sunshine permitting, we will symbolically burn chametz using the concentrated light of the sun." Cool!!!
Did they get the idea from Mah Rabu? (Doubtful; I'm sure lots of people came up with this independently.)