You wanna hear stupid?
One time i was shooting 2 ml, but only had 1 ml slin needles. So, i loaded up the first one and injected it. At which point i proceeded to refill the same syringe and half way through that injection, i looked down to see the other syringe still in it's package.
Despite having poked the needle through the rubber stopper twice and once into myself before the second injection, the needle didn't feel dull whatsoever.
Not sure where my head was that day, but i felt like the biggest idiot! Figured i might get an infection out of the deal, but luckily not.