To want a Starsky & Hutch stylee flashing light for the top of my car so I can....

[CrispyCod]

....pull over and bollock the people who do fucking dangerous things whist driving?

my cousin has one of these ..

I always want a loud speaker type attachment so I can say 'this is a 40 mile an hour zone you know' when they speed past me on the road out of town. Oh and a squirty water thing pointing at their screen for when they drive too close.

Oh, and a water gun too. That would be great.

should it be filled with brake fluid

Or cat pee

I've never known anyone to have one outside my friends in the Force but many years ago when I was much younger I dated a guy who had a police siren alongside the handbrake in his car. He'd simply lift the lever, the thing would emit a piercing noise and you'd suddenly see a whole lot of brake lights come on as the guilty reduced their speed!

I reckon I'd be the worst copper ever, the power would go to my head.