- a pen with a spring which can be open
- a piece of paper
Step 2: The trick
Open the pen. Take a little piece of paper, make a ball from it and place it in the bottom of the pen...on the hole where the nib come out when you press the top. The paper must be medium not too big and not to small. If it's big the pen can't be put together and if it's too small it will come out when you press the top. When you're ready put the pen together.
The trick is that when someone try to write they can't...it looks like it's broken...oh well you can always take another one...but let's imagine that all of them are "broken" :D
Step 3: The pen is ready
The pen is ready...just wait for the victim hehe...