The class put a whoopee cushion on the teacher's chair as a practical joke.
The head cashier laughed at them, convinced it was a practical joke.
Now the original and best practical joke has gone hi-tech.
Likewise, the lucky recipient will feel good because she'll know it's an authentic note from you and not some practical joke.
If you need to retaliate for a practical joke that was pulled on your or you want to surprise someone in your life, look to this list of practical jokes for inspiration.