I've been sent a wrong text before. I haven't send one to a wrong person though, fortunately. But the wrong text to me happened twice.
Once was my best mate. He was supposed to send a text to his g/f, but the message ended up in my phone, simply because my name was right after his g/f's name in the contacts. He was quite embarrassed when I told him that.
The second one was a girl, who's supposed to text her b/f, but for some reason, because we've been messaging each other, she texted me instead of her b/f, which I believe, she was just pressing the reply button from my text... She got embarrassed too!!
But hopefully I'll be careful enough not to text the wrong person