A quick mod for a tennis ball. Can be used for a variety of purposes including: squirtgun, water bottle, ammunition, and more!

Step 1: Materials

Tennis ball (duh)
Exacto knife, or any other sharp object

Step 2: Stab It!

stab your tennis ball (just once) with the sharp object. I found it was much easier to stab on the rubber lines, instead of messing about with all the fluff.

Step 3: Fill 'er Up

When you squeeze the tennis ball on either side of the crack, a hole will appear. hold this under a faucet and squeeze it a couple times to suck in water.

Step 4: Squirt

To make the tennis ball squirt, squeeze it! the water will come out in a jet about 10 feet long ( if you squeeze it hard enough). the picture doesn't do the gun justice.

Other Ideas:

1) emergency water bottle
2) pranks >:)
3) flamethrower? (NOT A GOOD IDEA, I don't suggest you fill it up with kerosene)
4) weighted ammunition for something (ex. The Easysling)
You gave me an Idea. It would be hard but imagine, taking a card board box and filling it with newspaper. Light it on fire and throw a oil or kerosene filled water balloon an watch it catch aflame!
Now you have given me an idea..... what happens when you light a paper airplane on fire?
I did that once. I drenched it in lighter fluid and threw it and it was a mini 9/11.<br />
That wasn't funny. Not at all.
You should of posted that comment the day before.
whatsup with you and 9/11
9/11. :(
thats like the lames joke ever, but totally funny :D
I concur.
...not funny...
Fill (inject?) them with runny paint and there ya go. Modern art!
back up paint ball weapon
And when you think about the 100,000 estimated civilians dead in Iraq using the knee-jerk reaction of this as a cover, you'd realise that's nothing more than a drop in a bucket.
don't use kero for flame thrower its way to flammable use mineral trerps or metholated spirits.=) grate Instructable<br/>
Methylated spirits has a was lower flashpoint that kerosene, which is what I assume you mean. Kerosene has to be "vapourised" before it will burn readily, like dropping a match into a tank of gas.
won't dropping a match into a tank of gasoline just put out the match?
yer that what I meant but I was way tired when I write it lol =)<br/>
my sister all ways takes our dog to the dog park and each time i get 5 + free tennis balls
just fill a water gun with burning stuff
well we just have a different kind of humor then, no hard felling and i just think all that terrorist stuff is just hot air (it's probably a bad translation of a dutch saying)
Kerosene or gas will quickly eat the latex of the balloon. However, you can fill a balloon with butane (found with cigarette lighters). Any flame -- a match, a small torch -- will cause the balloon to explode. We did this in the circus as part of our fire-eating act: clown wandered in between fire-eaters with butane-filled balloon, fire eater placed lit torch under balloon for big bang and fiery burst. Best done outdoors or in a room with plenty of ventilation (gymnasium).
add lighter fluid!!!!!! muahahahahaaha!!! tennis ball squirting lighter fluid + flame = flamethrower ( possibly a famethrower if you burn down your house and cbs/nbc/cia/fox news truck passes by... maybe not the cia... they'd nuke you...<br/>
Its called Guantanamo bay.
instead of shooting clay pigeons, shoot kerosene soaked tennis balls, PULL!!!
Nice instructable, it is kind of hard to push though. Will it get like broken in after a couple uses?
haha go Fahrenheit 451 on their ass
Nice! Something creative that you wouldn't think of!
hehehe.... Totally gonna give this to my dog.... hehehe. Jk i wouldn't do that to my dog :-) cool instructable.
haha simple and funny
i like the concept of such a simple everyday device becoming a new exciting toy! well done
But Seriously, Could you imagine? Toss one of these onto someone elses tennis match for an exciting surprise!
If you wanted it to spray on contact, I suggest you make the hole bigger...with the small hole, it self seals itself.
Wow... Fascinating... (Insert Awkward Silence Here)O.o

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