I actually got my kids good last year on April Fools Day.
With apple juice. More accurately fake apple juice.
I got them first thing in the morning. I told them to go in the family room and watch TV and I would make breakfast and call them in when it was ready.
Then I brought them all a glass of refreshing apple juice to enjoy while they were waiting for breakfast...
...and stood in the corner and watched as they slowly realized their juice was just apple-ly looking gelatin.
It was great.
The kids later claimed they should've none something was up when I told them to go watch some TV while I brought them a drink. Yes kids, you should've. But you didn't. HAPPY APRIL FOOLS' DAY!
Note: This prank inspired by Jelled Juice. I made mine with plain Knox unflavored gelatin and apple juice.
Now to think about something good for this year, who has a good (and easy) idea?