Here's a trick that can trick your friends into pulling a pen that can make them smell a really foul odor.
Step 1
Take apart the pen. You should have the ink thing, spring, the cap, and the body of the click pen.
Step 2
Take the bobby pin and put it through the spring.
Step 3
Put the bobby pin in the cap.
Step 4
Take your pliers and bend the ends.
Step 5
Place a strike anywhere match in the body of the pen.
Step 6
Reassemble the pen.
Step 7
Keep pulling the bobby pin until smoke comes out. Pulling the bobby pin causes the sulfur in the strike anywhere match to be released, creating the odor.
Step 8
Disassemble and add a new strike anywhere match as necessary.