Meaning of the word "accidents will happen in the best regulated families" in English

What does "accidents will happen in the best regulated families" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

accidents will happen in the best regulated families

US /ˈæksədənts wɪl ˈhæpən ɪn ðə bɛst ˈrɛɡjəˌleɪtəd ˈfæməliz/
UK /ˈæksɪdənts wɪl ˈhæpən ɪn ðə bɛst ˈreɡjuleɪtɪd ˈfæmɪliz/
"accidents will happen in the best regulated families" picture

Idiom

used to say that it is impossible to prevent all mistakes or accidents, even in the most careful or well-organized situations

Example:
I'm so sorry I broke your vase. Well, accidents will happen in the best regulated families.
The computer system crashed despite all our precautions; accidents will happen in the best regulated families.