Hints for security
Never use needles when playing with syringes! There is a big danger of hurting yourself or somebody else.
Needles are not interesting at all for water squirting : The water jet is so thin that you do not get a good range. If you want fine thin waterjets for inside, the classical small waterpistol is still the best.
Never use syringes that you find anywhere! Especially no used ones with a needle put on, this is very dangerous!
Do not squirt at electric devices, this is also very dangerous!
Do not squirt at anybody's face, especially not at the eyes!