What do you think about me tricking my grandmother into thinking she's drinking Coke?
Why would you try to trick your grandmother?
Because I replaced her Coke with another soda and I like to play tricks on her.
I know that you think you're just being funny but your grandmother could become upset at you if you trick her. You should respect her and not try to trick her. Let her enjoy her soda and don't play tricks on her.
Nah, this is funny and I'm not going to stop anytime soon.
It's wrong to constantly prank your grandmother by messing with her food or drink. She will have trouble trusting you when she should be able to. It's best to show the same respect you would want to be shown.