Step One, This Isn't The "Popular" Way, Just Another Way That Looks A Lot Like The Title Describes, And I Have Pictures. Yay!
Step 1 - Put Any Hand Out So All Your Fingers Are out, Then Tuck All Of The In With The Thumb Not Noticeable
Step 2 - Bend Your Thumb So It's At A Right Angle and make it so it looks like the other side of your thumb. Cover The Crack That Show's Your Thumb There With Your pointer.
Now Maybe Some Strong Pull Gestures Then Pop! Pull The Thumb Off and amaze Your Friends! Don't Pull It On The Same Person To Many Times!
Happy Tricking! C: