I know this is almost two years old, but it still makes me smile every time I see it.  In late 2014 I saw a video showing pong running on a Cisco IOS router using the TCL shell.  Now I put it on the routers in my lab for entertainment.  The only weird thing is that the cursor disappears on Putty when I the script.  Take a look at the original post on the Cisco support forums here.

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