You know you're a grad student if...

Charlotte's Web has a good list of ways to tell if you're a grad student. The ones that made me laugh nervously:

• more than 25% of your textbook is "left as an exercise for the reader."
  
• you have ever brought a scholarly article to a bar.
  
• professors don't really care when you turn in work anymore.
• you have given up trying to keep your books organized and are now just trying to keep them all in the same general area.
• you reflexively start analyzing those greek letters before you realize that it's a sorority sweatshirt, not an equation.
  
• you find yourself explaining to children that you are in "20th grade".
  
• you start refering to stories like "Snow White et al."
• you wonder if APA style allows you to cite talking to yourself as "personal communication".

I would add several ways you know you're a grad student with kids:

• You have taught a section or lab with stickers on your shirt and did not know it.
• You assess potential babysitters by their CPR certification and whether they were conscientious students in your class.
• You spend more time in the lactation room than in your office.
• Corollary: You can pump hands-free and read journal articles.
• Double corollary: You know which types of articles are more likely to decrease your milk supply.
• You have never helped with a Saturday recruiting event for your department.
• You feel more comfortable eating lunch with the junior faculty than with the other students.
• You can only participate in IM sports after the kids' bedtime.
• You start running simulations for your thesis at 3am when your infant wakes up to eat.
• You are not kidding when you hope that you graduate before your oldest child.