It's all fun and games — until you can't use your phone anymore.
Two sons wanted to give their New Jersey father the best birthday surprise for him before he turned 62 on Saturday, so they decided to put up a huge billboard with a birthday message.
The sign revealed Chris Ferry's phone number, his photograph and the words "WISH MY DAD HAPPY BIRTHDAY".
![Sons prank dad with giant birthday billboard, bringing in thousands of birthday messages. Photo / CBS](https://www.nzherald.co.nz/resizer/v2/7MJNMQMG5LPVF72MKVIMDP6XI4.jpg?auth=081cf04c2e78685943f80df26b45c73e7027beaf7308762234933a822b05da03&width=16&height=9&quality=70&smart=true)
What Chris Junior and Michael didn't expect, was that their father received over 15,000 texts, calls and Facebook messages from people around the world.