Here are a couple examples of the double bind technique:

I know my daughter doesn't like to wash the dishes or to vacuum.  If I asked her to wash the dishes, she's going to try to find a way to get out of doing the dishes.  If I ask her to vacuum, again, she'll try and find a way to get out of vacuuming.  But, if instead, I offer her a choice, here's what will happen.  First, I ask her, "Do you want to do the dishes or do you want to vacuum."  She knows she has to make a choice.  So, instead of focusing on a way to get out of doing what I've asked her to do, she focuses on which she'd rather do.  Though she doesn't like to do either one, she prefers vacuuming over doing the dishes.  The double bind occurs because she doesn't want to do either, but she has to make a choice.  And she'll make the choice that is the more emotionally compelling choice for her.  And she will likely have a much better attitude vacuuming because she was able to get out of doing the dishes.

People are often conflicted about quitting smoking.  There's a part of them that wants to continue smoking because they enjoy smoking, yet there's a part of them that wants to quit because they know that's what's best for them healthwise in the long run.  So, here's a doublebind.  "You can continue to smoke and poison your lungs and throat till you get cancer and die a painful and ugly death, or you can choose to be a non-smoker and live a long, healthy life."   If you continue to present this double bind suggestion to a smoker during hypnosis sessions, there's a good chance the person will quit.

You can use double binds in almost any type of situation.

More hypnosis techniques:

Eye Catalepsy

Eye Fixation

Staircase Technique

Metaphors

Fractional Relaxation

Conversational Hypnosis

Indirect Suggestions

Double Bind

Guided Imagery

Visualization

Post-Hypnotic Suggestions

Direct Suggestions

Confusion Technique

Tongue Relaxation