British plugs are however the worst to step on.
If you have, then why was it unplugged? A plug should be plugged in (in which case it is safe) or it is superfluous.
I've managed to struggle through to the age of 54 without treading on one of our thrusting tri-pronged plugs. It is surprisingly easy to avoid stepping on them.
It’s really not that complicated and I’d feel completely comfortable doing it myself today but I understand how that may not be true for everyone so the requirement is probably reasonable.
That said, you're theoretically supposed to do a full set of earth resistance measurements etc. on the new wiring, which is hard if not impossible unless you've got proper electrician's test equipment. But in reality no one does that when DIYing it.
The flat back of most plugs increased the risk of standing on this type of plug. It's similar to the experience of standing on Lego, except it will dig much deeper into your foot, and falling over is better than putting all of your weight on it.
It can be a common occurrence, because using an extension cord or an appliance you don't always need to have plugged in can just be laying around. And kids aren't known for being tidy. If you managed to get past being a clumsy kid and had the self awareness to avoid it, props to you.