#1237: QR Code

XKCD comic, described below.
Transcript

[[A smartphone. On the display, the following text: "To continue installing, scan this code. 12 seconds remaining". A particularly recursive QR code is displayed on the screen]] How to freak out a mobile app user.

Remember, the installer is watching the camera for the checksum it generated, so you have to scan it using your own phone.

ExplainOriginal