Warning: pal... don't do most things written on here, k? Consult your doctor before doing anything dangerous.
Category 1: anything
1: Don't use them at all.
2: Throw away the paperclip since you don't need it, and use the pen to write something.
Category 2: you MUST use them both!
1: Insert the paperclip up your ass, and use the pen to write something.
2: Put the paperclip and then pen in the microwave, and feel the thrill of the impending danger.
3: Cook the paperclip and the pen, producing toxic fumes from the combustion of the ink and plastic.
3.1: Inhale the fumes.
3.1.1: Deeply.
3.1.2: Normally.
3.2: Run away as fast as possible and leave your house!
4: Insert the paperclip up your ass and use the pen to stab your own eyes.
5: Cut your skin with the paperclip, just like someone who does self-harm, put the pen in that blood and use your blood to write something with the pen.
6: Insert the pen up your vagina (if you have one), and the paperclip up your ass.
7: Melt the paperclip and put the molten material on your ass.
8: Melt the paperclip and drink the molten material.
9: Put the pen and paperclip in the freezer.
9.1: And leave them there.
9.2: And put the frozen pen and paperclip up your ass.
10: Put the paperclip up your ass and the pen inside your left shoe, and then go outside like that, and see if anybody notices.
11: Put the pen inside your left shoe, the paperclip inside your right shoe, go outside like that and see if anybody notices.
12: Break the pen, extract the ink from it, dip the paperclip in the ink and use it to paint your face so that you can look like a warrior!