Disclaimer: I am not responsible for any injuries such as bruises, scratches, or drawn-on items.
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Step 1: Gather Items
Gather one "Pentel Wow! bk440" pen and a random pen that uses a spring.
Someone to prank.
Step 2: Dissasemble the Pens
This should come natural to you, you should be a hacker !
While doing this you should make sure that you separate the pieces so you know which goes in to the "Pentel Wow! bk440' pen case in the next step.
Step 3: Insert Spring
So, seeing that you've come this far I'll show you how to do this. Take the spring from the random pen and drop it into the "Pentel Wow ! bk440" pen case.
Step 4: Assemble Pen
Assemble the pen the way you found it, by dropping in the ink cartridge and and pushing the clicky-thingy back in.
Step 5: How to Prank Someone With the Pen
Give somebody, preferably a person that wouldn't mind a nudge of humor, the pen and ask them how to disassemble the pen. If you built it correctly the button, ink cartridge, and second spring should shoot out at them.