This is both a fun and engaging trick that is a great start for an aspiring magician, it's easy, fun to perform, and it being published for free is not ripping anyone off. Enjoy.

[edit] Steps

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Say you want to impress a kid, just exclaim "Watch!" pull a pen out of your pocket and hold it in your right hand.
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Hold your left palm up in front of you. In this trick, for it to be convincing, you will have to either count out loud or in your mind a beat to perform to.
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Hold the pen near its tip and raise it beside your head. You want to be facing perpendicular to your spectator's line of sight. This way whoever is watching cannot see the pen as you hold it near your ear next to the side of your head.
You then tap the pen against your left hand again. You can keep count, saying one, two, and then making it vanish.
Now comes the actual "work" of the trick. As you raise your hand for the third time, carefully and without losing a beat, place it behind your ear. You must do this smoothly and while focusing on your hand. The counting is important to help you keep the timing exactly the same each time you raise your pen-holding hand. Try to perform every raising quickly to prevent detection.
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Fluidly, but most importantly, swiftly, clap your right hand against your left. Bam! The pen is gone!
Perhaps you are wondering how you make the pen reappear? Whatever you do, don't seem like you don't want to turn your head to face your audience head on. Say you're going to tie your shoelace and bend down; if they look away, quickly pull the pen from behind your ear. Hold your hands against your head as if this great psychic exertion pains you greatly. While clutching your head in agony, slide the pen into your hand and produce it from wherever you see fit. If you try any of these suggestions wait a few seconds after you perform the trick so people will be less focused on you. If someone is watching your every move to discover the trick, say you have to go the restroom, anything!
Another ending to this trick is to, as in the first part of the trick, raise your hand to behind your ear on each of the counts. Then, on the 3rd count, swiftly grasp the pen from behind your ear and place it in the other hand! Voila!

[edit] Tips

A good misdirection is to take off the cap and put it in your hand, making it seem as if you are trying to make the cap disappear, then when the whole pen disappears, act confused as if it all went wrong, while the spectator is equally amazed.
Make sure the audience is looking at your palm of your bottom hand, not your top hand. To focus the audience on your palm, move it slightly. This will make the audience confused. Another way is to put a coin on your palm and say that "I'm going to make this coin disappear...". The above tip works well too.