This is an AWESOME instructable. The effect is you put your fist to your mouth and puff out your cheeks. You take your fist away and smoke comes out of your mouth. Please excuse the photos. They aren't mine. I don't know how to put photos on here.
Step 1: Preparation
NONE! Unless you count making your hand into a fist. So then, the preparation is to make your hand into a fist. Be ready to put your fist where your mouth is.
Step 2: Put Your Fist Where Your Mouth Is
Now, after you have made a fist with your hand, put your fist where your mouth is: the side of it, where your thumb is. Do it just like in the picture. It's so easy, a baby can do it!
Step 3: Blow
Puff your cheeks out REALLY hard like the kid in this picture, but don't make it hurt too much, I don't want any exploding cheeks. This part is the hard part. Inside your mouth, you are actually squeezing the air into what is called fog. As you should know, fog is just water, or in this case, spit (I think).
Step 4: Open Your Mouth
After you have finished the other steps, take your fist away and open your mouth. Don't breathe out. The fog should come out of your mouth naturally. One last tip while you are blowing against your fist: Don't breathe. I know you think you'll look like this fish holding it's breath but if you breathe, you'll mess the whole thing up because the fog will just travel down your lungs. It doesn't matter if you breathe through your nose or not, your nose is connected to your mouth so it would still mess it up.
Step 5: Other Methods
Another method is to fill your cheeks halfway with air. Then you cluck your tongue really hard (but be careful not to let any air escape). After about five clucks, put your fist to your mouth and blow just like in step three. Remember, you still can not breathe. I prefer the first method but for those of you who can't do it, try this method. Also, if you have a new method, please post it so I can include it in this instructable. And if you have seen this before, don't say stuff like, "Everyone knows this trick, it's so old". Please comment and rate this instructable.
Step 6: Smoke From Bottle
Okay people, here is a variation with a bottle. This will only work with bottles that have condensation on the inside top of the bottle; the little water droplets. So, the first step is to put a spoon full of water into a plastic bottle. Put the cap on and let it sit on the counter overnight. So, take the cap off and put your lips to the bottle. Blow as hard as you can. You might want to squeeze the bottle a little. Take your mouth away and squeeze the bottle. You should see water vapors that look like smoke come out of the bottle.
Step 7: Tips
A tip is to have a LITTLE bit of water in y our mouth when you try this. Also, I have found out that the clucking of the tongue helps a lot. Please comment and add tips so that I can put them here if you have one.