What kind of person winds down the window of their car and tosses out sweet wrappers or an empty cigarette packet or a plastic bottle? The kind of person who doesn't give a damn about others, that's who.
I've witnessed it so many times - that car-window disposal system. Most recently just a few days ago as I was driving on the outskirts of Bray.
It makes my blood boil. To the extent that, in the past, I have actually hightailed it after the culprit, flashing my lights to show my annoyance. The last time I was given the two-finger salute, indicating that it was none of my business.
And that's what's wrong. The litter louts think that it has nothing to do with the rest of us when, in fact, it has everything to do with us all - both with our local environment right now, and with the impact on our global environment into the future.
There's a part of me that can't quite believe how strongly I feel about this for I've never been much of an eco warrior.
But as I get older I find myself more and more concerned about the damage being done to the planet - and the state that my generation will leave it in for those who come after us.
It's about responsibility. And it's more than worrying that the results of the most recent Ibal (Irish Business Against Litter) survey illustrate that the overall litter problem in our towns was worse in 2019 than in the previous year.
I see it in my own town. Every day of the week.
There's one particular area close to my apartment that is constantly littered with plastic bottles. So it's little surprise to learn that of the 70,000 tons of plastic bottles used in this country every year, only 40pc are recycled. Meaning 60pc aren't.
And while you might think that seeing such items scattered around their neighbourhood would deter people from compounding the problem, the opposite is actually true.
Litter breeds litter. It's what social scientists call the 'broken windows syndrome', whereby people are more likely to deface a particular area if they see that the place is already sullied.
I'm sick and tired of flashing my lights at litter-lout drivers, of side-stepping dog poo on my morning walk, of ramming my hand into my dog's mouth to remove the chewing gum (poisonous to dogs) or cigarette butt that he has found while snuffling around on the ground - and of playing the role of the Litter Fairy in my own apartment block.
Yes, the Litter Fairy. For some residents obviously believe we have such a divine being in residence.
Why else, otherwise, would they discard unwanted post on top of the communal post-box instead of disposing of it themselves?
Fed up watching leaflets and envelopes pile up, I took on the mantle of the Litter Fairy some time ago. But no more.
It was Fine Gael election leaflets - complete with the actual apartment number - left lying on top of the post-box that were the straw that broke this fairy's back.
I put them back into the recipient's box. Next day they were back out again. I put them back in. And so it continued - until I wrote a note asking who, precisely, did they think disposed of these - the Litter Fairy?
And that, finally, was the end of Simon Harris peering at me from the top of the post-box.
My Litter Fairy days are over. It's time for everybody to take personal responsibility. For the truth is that there's no magic wand when it comes to tackling litter. And without all of us pulling our weight, no fairytale ending either.