throw cold water on (something)
to discourage or forbid something
My boss threw cold water on my plan to go to New York City on a business trip.
Cake Taste Test
How fun would this be.? Take your girlfriend to taste test cakes for a creative date night. Then have the bakery present your last cake with a bride and groom on top and a ring box as well. Little does your lady know you just killed two birds with one stone and pick out your wedding cake at the same time.