I am at a career crossroads; should I become an astronaut, a fireman, or a system administrator?
This is the kind of question that these "handy comparison charts" were just made to answer:

• PURPOSE OF YOUR CAREER
  Astronaut:Advancing scientific knowledge for the good of humanity.
  Fireman:Saving lives and property.
  Sysadmin:Assuring uninterrupted access to alt.binaries.erotica.sheep.
• ADVICE YOU'LL GIVE KIDS WHO WANT TO FOLLOW IN YOUR FOOTSTEPS
  Astronaut:"Study science and math and eat your vegetables."
  Fireman:"Study science and math and eat your vegetables."
  Sysadmin:"DON'T DO IT! RUN AWAY!"
• QUESTION YOU'LL BE MOST TIRED OF ANSWERING
  Astronaut:"Where do you go to the bathroom?"
  Fireman:"Do you really slide down a pole when the alarm goes off?"
  Sysadmin:"Can't you do anything about all this spam I've been getting?"
• WILL YOU EVER BE ON TV?
  Astronaut:Yes!
  Fireman:Occasionally.
  Sysadmin:Only MSNBC's "The Site," which doesn't technically count as TV.
• WILL YOUR JOB EVER GET ANY EASIER?
  Astronaut:As computers get more and more advanced and able to control more of the functions of the space vehicle, yes.
  Fireman:As more and more people install smoke detectors in their homes, yes.
  Sysadmin:As more and more clueless newbies discover the Internet, absolutely not.
• INSPIRING MOVIE ABOUT YOUR PROFESSION
  Astronaut:"The Right Stuff"
  Fireman:"Backdraft"
  Sysadmin:Uh... gee, I'm really drawing a blank here... "Wargames"?
• YOUR WORK HOURS
  Astronaut:Fairly long days during the mission, but lots and lots of time between missions to relax.
  Fireman:24-hour shifts, but 48 hours between shifts to relax.
  Sysadmin:Not really "work hours" or even "work days"... more like "work millenia."
• FRINGE BENEFITS OF YOUR JOB
  Astronaut:Lots of good stories to tell to impress members of the opposite sex.
  Fireman:Lots of good stories to tell to impress members of the opposite sex.
  Sysadmin:You get ALL of the jokes in "Dilbert."
• NUMBER OF COMPLAINTS ABOUT YOUR PROFESSION
  Astronaut:A few, from people who think the government should be spending its money in different ways.
  Fireman:A few, from people who think you take too long to arrive following a 911 call.
  Sysadmin:You'll have to learn what comes after "trillion" to be able to count them all.
• YOUR VEHICLE
  Astronaut:Multimillion-dollar space vehicle atop multimillion-dollar rocket.
  Fireman:Big red truck with flashing lights and siren.
  Sysadmin:1978 AMC Gremlin.

In conclusion, if the sysadmin option has seemed the most appealing in even one of these categories, you should become a sysadmin.