The Year 2000 Bug is going to end civilization!
Using two numbers to represent a four-digit year (say, 60 for 1960) poses a problem when the year 2000 rolls around and computers think they've time-traveled back to 1900 and start acting like they're steampunk.
Survivalists and scammers hopped on the Y2k gravy train in hopes of cashing in on the fear generated by The Millennium Bug. Nuclear weapons worldwide would automatically launch, planes were going to drop out of the sky, and your alarm clock was going to strangle you in your sleep with its cord (not to mention TOTALLY ruin New Year's Rockin' Eve).
The need to preserve space during the punch-card days of programming started this whole bit of sloppy coding.
Y2k is currently in the past.
- Passed without much notice.