We've all been in a situation without scissors and end up ripping a zigzag line of paper. This happens all the time in forums you have to fill out. This instructable aims to eliminate the problem by teaching you to rip paper in a straight line. I'm not claiming this is my idea, many people have thought of it before me and it's a trick I've learned from my parents.
Step 1: Folding
First fold along the line you would like to rip and crease hard.
Step 2: Preparing the Crease
Now, use your nail and run it along the fold line while squeezing. Fold the paper the other way and repeat.
Step 3: Ripping
Unfold the paper and use two hands to pull it apart (do not rip it side ways).
Congratulations, you now have a straight rip that is probably straighter than you can cut with scissors (without a paper cutter and if you did it right)