I remember at the start of Gmod 10 when there was loads (and I mean LOADS) of "admin noob banner gun" that used to permaban you when you shot someone..
A very young and annoying server admin wanted to ban me, so he spawned a first gun (this idiot kept spawning it with right click on the ground then ran to it), I hid behind his friend and he permabanned his friend, removing all his friend's props in the process (it was one of these prop protection that removes everything)
Then I suicided and respawned, whipping out my 357 and shooting him, then I hid under a dumpster (I actually did, and he didn't see me), I saw him spawning the admin gun, and spawned a barrel and used the physgun to propel the gun toward me, I grabbed it, then proceeded to ban the kid, and pretended to be an admin for about an hour, banning every friends of the kid.
So once the server was clear, I got banned for:
"fu hacker noob"