Walk around the airtower when you are online and keep walking. Then walk downstairs and if you're unlucky you will get glitched and randomly die as if you would have walked of the air tower. Basicly i was walking to the first floor and i was teleported to the ground floor to the door.
Go on laggy server stand in front of zombie for 10 seconds if does not follow you have movement lag.
Go in allot of high building the whole time and you will eventually just fall through for example in Elektrozavodsk