SOMETIMES the simplest ideas are the best - and most lucrative. Who would have thought a plastic disc, Pogs, would become a worldwide phenomenon, or that the Rubik's Cube shift more than 100 million units?

That's the reality of the playground crazes that have seen everything from virtual Tamagotchi pets to the pampered, preened and pleated My Little Pony becoming the must-have school accessory.

Some linger longer than others - Panini football stickers are still kicking about, while Pogs sank without trace.

Nowadays, it's the turn of the Heelys, the trainers that put wheels in your heels.

The humble rollerskate first made an appearance back in 1759, but the skate was brought bang up to date by Roger Adams, a Californian skater who first launched his invention in 1998.

Heelys became the Buzz Lightyear of Christmas 2006, with the British distributor selling around 250,000 pairs of the £55 trainers in the run up to Christmas.

But the backlash has begun. Kelvingrove Art Gallery and Museum has banned Heelys, and Braehead Shopping Centre and many Tesco outlets have clamped down on their use.

And The Royal Society for the Prevention of Accidents has advised Heely wearers to use helmets and kneepads, and the World Against Toys Causing Harm (WATCH) put Heelys at the very top of its list of "10 worst toys for 2006".

We went out on to the streets of Glasgow to ask what was the childhood fad that rocked your world. Recalling the crazes that meant so much when we were youngsters Holly Gordon, 20, student, East Kilbride. I collected the Pogs, and I remember a special edition Tasmanian Devil Pog. It was a small disc, like a big tiddlywink, and we would bring them into class and throw them at one another. Eddie Connolly, 60, retired, Broomhill. Meccano sets were big in those days, although I wouldn't say they were my favourite toy. I hated trying to do the nuts and bolts with the tiny wee spanners. I was more into football. Louise McNeill, 41, office manager, Cumbernauld. Probably Cindy dolls, they were a big favourite, and the Tiny Tears and Pippa dolls. One friend had a front room as a playroom and to me that was luxury. Ken McIntosh, 57, architect, Erskine. I made a lot of Airfix models - Spitfires and Lancaster bombers. When I was at primary school there was two or three guys who were into that as well. And I was into yo-yos, too. Rita McColgan, 55, part-time sales assistant, Bearsden. We did a lot of scrapbooks at school - I used to love the angel ones. Everyone collected them and if you ended up with doubles then you swapped them. Theresa Dar, 43, finance worker, Pollok. I remember the Tracy doll. You pressed a button at the back and its hair would grow out of the top of its head. And I collected Tiny Tears dolls. We also played with scrapbooks. Gordon McCathie, 26, civil servant, Edinburgh. I liked Action Force figures, they were like small Action Men. It had a cult following at the time. I had about 50 or 60 figures, plus all the wee tanks and helicopters. Morag Rodden, 59, housewife, Muirend. I collected autographs, that was my fad. I always carried my book about with me. I got Acker Bilk and The Kinks. I was at school with Lulu so I didn't need her autograph - I had it on my jotter. Allan Dryer, 50, environmental modeller, Strathyre. I still have a set of antique Matchbox cars because my mother used to work with Matchbox and she got them cheap. I've been building the collection since I was nine. Lauren Frew, 19, pharmacy student, Barrhead. I had a Tamagotchi, a virtual pet on a keyring. You had to feed them and play with them to keep them alive. Everyone took them to school until they were banned.