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X is usually encountered when something unexpected occurs. While the origin of the term is unknown, according to one theory – it was because there was no logical option give to the user on encountering X.
Over the years, the company behind X tried to soften impact of X by adding an emoticon.
Can you guess what am I talking about?

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Blue Screen of Death
Officially called the stop screen, or stop error, the blue screen of death (BSOD) is a most unwanted error, second only to malware or ransomware in indicating that a user is in for a very bad day. It comes with no warning and all unsaved work is immediately lost. And given what it indicates, that could be the least of a user's problems.
Read More about the outage faced by millions of users recently.
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