xkcd is awesome.
I hate that "sudo" joke, I've seen it waaay too many times.
Agreed, but the first couple times it's awesome.
For instance, on campus, I saw a sign saying "Join the American Computer Society" or some other group name similar.. and then the next phrases followed:
"No"
"Sudo join the American Computer Society"
"Okay."
I laughed for a few minutes the first time I saw it (even though it was about -15F. Haha)