http://www.regiftable.com/regiftingrobinpopup.html

Regifting Robin will read their mind. The instructions are in English, but here are in Spanglish:

First select a two digit number. (For example 25)
When you have the number, subtract the first and second digit of the number chosen. (Example: 25 to 2 - 5 = 18)
Remember the number, and give click "next".
Find the box with the number you came at the end, and remember the object that was in the box. Then give click "next".

Pow! Is that the object you chose?
Try several times if you think it's a coincidence.

If you want to know as possible, leave a comment