Oookay, I know the tradition of throwing rice at a wedding is pretty dead by this point (as are the birds, who eat the rice, drink water, and swell up until they pop).
Still... I don't think this substitution will catch on.
I also like how her expression is all "WHEEEE!" while his is all "....what the fuck did I agree to???"
That's actually a myth spread by wedding venues. Birds don't eat uncooked rice. It has to be cleaned up after the wedding (before it rains, or the starches cause it to adhere to the pavement).
Still... I don't think this substitution will catch on.