Here are some reasons you should not scan random QR codes:

* QR codes can contain hyperlinks that take you to websites which may attempt to gain control of your device using zero-day exploits.
* QR codes can contain hyperlinks which take you to websites that try to de-anonymize you by recording your IP address or other device characteristics.
* QR codes can contain zero-day exploits targeting the QR code reader which may attempt to gain control of your device, though an individual QR code reader may or may not be vulnerable to a particular exploit.
* QR codes can contain hyperlinks to shocking or offensive websites.

Based on these reasons, it is good to exercise caution when scanning QR codes of unknown origin.
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