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.
You can make your victim think that they've received the "blue screen of death" with this simple practical joke.