Screwy

As I was changing the bulbs on the bedroom light, I realised that it needed bulbs with a screw rather than a bayonet fitting. 

So, off I went to the supermarket to change them. 

As I was trying to fit the new bulbs, I realised there were two different sizes of screw fitting: the correct ones, and the ones I had. 

So, I went back to the supermarket to change them. 

As I was leaving, a police car was pulling up. I imagined the puzzled staff pointing me out, saying "we're pretty sure it has to be some sort of scam. We just can't work out what it is."