mIRC 6.12
Copy this into the remotes panel:
on 1:CHAT:*:close -c $nick
Then open another mIRC, connect to te same server an (important) JOIN THE SAME CHANNEL of the other mIRC.
DCC chat the first with the second one and mIRC goes in crash with this error when you tipe someting in that DCC chat window:
MIRC Caused an Invalid Page Fault in Module MIRC.EXE in 0177:0042cbe4.
NOTE that the bug doesn't appear if you ar NOT in the same channel with both mIRCs, and the close -c $nick works if you use it in the on 1:OPEN:=: event.
Cheers,
sazeMaster