Not at the Same Time or Not at All

Totally frivolous today, but short. . . .

  Having kids seems like a lovely way to grow your own friends.  And i've heard that you never know true love until hou have grandkids.  i joke that i tried to have my grandkids first, but i just couldn't pull it off. 
  (Hey, a coworker the same age was having her first grandchild at the same time i was expecting Boom....)
  Just not possible.
  And it seems i'm always wanting to use the restroom and a drivethrough at the same time, but just can't figure that one out either.  So - yes, you'll be relieved to know - i always order inside.
Either is possible, but not together.
  In-CO-possible.
  Anyone else come up with stuff like that?