Don't report. Click, but don't engage otherwise. The reports will always fail, but the ad view won't cost them as much.

Every click costs more money than a view, drives up their overall ad rate, and gives them false statistics on who's interested and how many people are interested, which only makes ad targeting harder and internal analysis more difficult.

Also, obligatory AdNauseam mention. (note that this can be less privacy-preserving than using an adblocker on its own, as it still could allow ad networks to fingerprint you across sites. It obfuscates ad interests and generates fake ad clicks to drive up advertising costs for advertisers that don't respect the Do Not Track opt-out standard. It can't hide you entirely from the ad networks themselves.)

apparently piefed is a place to find me, a person who cannot read the title :/

Cut the water supplies. The heat created by DCs should be enough to cook itself.
You can also create a short circuit between exposed cables, that should chain react throughout the whole datacenter.
Entering should be easy if you're there for maintenance.