Vixie cron’s @reboot

I learn something new every day. I’ve been using computers for over a decade, and not a day goes by that I don’t learn something new about something I knew a lot about.
Vixie cron’s @reboot (Jeremy Zawodny’s blog)

While looking at the manual page for the crontab file format, I
discovered a chunk that I’d never seen before:
Instead of the first five fields, one of eight special strings may appear:

    string         meaning
------         -------
@reboot        Run once, at startup.
@yearly        Run once a year, "0 0 1 1 *".
@annually      (same as @yearly)
@monthly       Run once a month, "0 0 1 * *".
@weekly        Run once a week, "0 0 * * 0".
@daily         Run once a day, "0 0 * * *".
@midnight      (same as @daily)
@hourly        Run once an hour, "0 * * * *".

Hmm. @reboot. Isn’t that handy. There’s an easy way to give
users the ability to run something at boot time without root
access.