or better yet, have some fun with the newbie co-worker jailbreaker that won't freakin' leave me alone by installing this and setting the ios fw to 4.1.
Him: Sweet, i spent all last night updating to 4.2.1 and jb'd using gp :d.
Me: Nope, says here you're still on 4.1
him: What!?

Me: Uh huh. Looks like you missed a step. You sure you used the 4.2.1 ipsw? Perhaps you should redo it
just in case
him: Aww man, i gotta do that all over again?
Me: Looks that way

Me: By the way.....looks like you have a lot of stuff on your iphone. Says you only have 80mb's of storage space left on your 32gb phone. What are you putting on your phone?
He continues to pester me, he gets fakeclockup installed and i set it to 1/10 default speed. That should keep him busy for awhile