Punch Lines In Need of Jokes

These are what seem to me to be brilliant punch lines, but I don't know what the setup is.
  1. Pregnant paws!
  2. If you can tie your ears in a bow, you've got bigger problems than your potentially revolutionary politics.
  3. The big bad golf.
  4. Binge-watching the river Netstyx.
  5. R2-D2 the rescue.
  6. Bruce Springsteenage angst.