Btw, the greatest advantage to this approach of using $read to randomly select a line, is if you should decide to remove lines, like line 3's "mode +h", you don't have to re-number all the lines below it. Just delete the line you don't want.
To quickly create a new chance.txt file in your mIRC directory for $read(chance.txt) to work, type the following in mIRC:
/run notepad chance.txt