I'm going to pour vinegar into my dads liquor
Why would you do something so mean?
I think it would be a fun little prank to play on him.
I do not think that is a good idea. He is not going to be happy about drinking vinegar. In fact it is pretty rude.
Well, he's not going to find out.
When he drinks it he will find out and he will suspect someone in the house did it. Why ruin your relationship for a prank?