This Instructable will show you how to make a very simple ninja star with something everyone probably has in their house and you can also make chili with it!!!!(dont throw this at anyone it can really hurt someone,i got my to peirce 3 inchs of drywall.)this pic isnt the real nija star you will be building srry.

Step 1: Gather Materials

To make the ninja star you will need:

-One large tomatoejuicecan(works the best)
-A can opener with the pointy thing as in the picture.

Step 2: Step 2

Step2:Make 2cuts with the pointy part of the bottle opener across from eachother like shown in the picture.I didnt have any tomatoejuice so I used a tuna can but the large tomatoe juice can works the best. You will have alot of trouble making it if you don't have a tomatoe juice can.

Step 3: Step3

Now do the same thing just turn the can and make 2 more cuts across from eachother as shown in the picture.

Step 4: Step 4

Now cut between all the other cuts evenly as shown in the picture.

Step 5: Step 5

For this step cut on the 8 flaps and then it should have sharp points on it,do this on the next 7 flaps and it should fall to the bottom of the can but if one of the points is still stuck to the can take pilers and twist it off...................then find a flat surface that is hard like your garage cement and then take a rubber malet or your feet and flaten the points so they are level and your done.Srry there are no pics for becuase my camera ranout of batteries. Try making 2 ninja stars and then hotgluing them together for a stronger impact or something like that.