Ladies and gentlemen, I give you...the Unity Thermite Reaction!
The thermite reaction is a very dangerous and extremely cool chemical reaction between powdered iron oxide and aluminium. It can't be extinguished, and you get intense heat and white-hot molten iron.
I've even written a little homily.
"Brothers and Sisters, as we watch the magnesium ribbon that symbolises the wedding day burning down towards the iron oxide that symbolises Michael and the aluminium that symbolises Karen, we pause to remind ourselves of how the white-hot flame of their love, a flame which cannot be put out, forges the strong iron of marriage. Amen. And wasn't that awesome?"
I think it might have to become part of the Slappatarian marriage ceremony. The outdoor Slappatarian marriage ceremony.