I used to work at a university, and would routinely (with authorisation) nmap the entire /16. I discovered this would freeze the TCP/IP stack on a bunch of VMS

I used to work at a university, and would routinely (with authorisation) nmap the entire /16. I discovered this would freeze the TCP/IP stack on a bunch of VMS boxes on campus - luckily on VMS that was restartable without bouncing the box :-)