One chestnut from my history in lottery game development:
While our security staff was incredibly tight and did a generally good job, oftentimes levels of paranoia were off the charts.
Once they went around hot gluing shut all of the “unnecessary” USB ports in our PCs under the premise of mitigating data theft via thumb drive, while ignoring that we were all Internet-connected and VPNs are a thing, also that every machine had a RW optical drive.
Often times you’ll find that the crazy things IT does are forced on them from higher ups that don’t know shit.
A common case of this is requiring password changes every x days, which is a practice that is known to actively make passwords worse.