Here is a conversation I had with the linux console. Try it for yourself!

sam@laura:~$ echo !
!
sam@laura:~$ echo !
!
sam@laura:~$ echo !!
echo echo !
echo !
sam@laura:~$ echo echo !!
echo echo echo echo !
echo echo echo !
sam@laura:~$ echo echo echo ! echo !
echo echo ! echo !
sam@laura:~$ echo echo echo ! echo !!
echo echo echo ! echo echo echo echo ! echo !
echo echo ! echo echo echo echo ! echo !
sam@laura:~$ echo echo echo ! echo echo echo echo ! echo !
echo echo ! echo echo echo echo ! echo !
sam@laura:~$

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