Because the warranty is void if the seal is broken.
Couple's Daily Question Mug
Coffee Mug
A: Dad they questioned me for 3 hours but I told them nothing."
3 hours, but it takes 1 day for it to get to Hot
Within 3 hours they can train a man to stand at the side of a pool and feed them fish !
3 hours later* Her: What are you talking about
Dad, they questioned me for 3 hours, but I told them nothing!!!"