I have been using an iPhone since the first model came out and always been very careful with my phones, non of them had their screens cracked. When I bought my iPhone 6, I went even further - bought a silicon case and a screen protector, which I haven't used on my previous phones. On one occasion, when I opened the screen by pressing down and holding my thumb on the button to unlock the phone, the glass cracked between the button and the metal cover at the bottom. I must have pressed on it a few times, because I only realized it cracked when the bezel around edge of the button felt a bit sharp.
I work in Hungary - no Apple Store, only authorized dealers - they pretty much laughed at me and offered a swap for a refurbished model for about 300 Pounds. They gave me a number to call Apple - but they just simply couldn't offer any alternatives, since my phone was declared 'damaged out of warranty' by Apple's service centre in the Netherlands.
Fortunately, the screen hasn't cracked - it is only around the edge of the phone, hence the damage is only cosmetic - although I'm terrified it'll crack into the screen eventually. Every time I speak to someone, I'm being accused of deliberately breaking my phone - I can understand, that the manufacturers warranty doesn't cover incidents such as this, regardless of how it happened. I'm just very disappointed how this issue was handled altogether. 😟