Phrases that never sound sincere (even if they are.)

I will be updating this as I think of/hear more
  1. "Good for you."
  2. "I'm happy for you."
  3. "...when you're done eating..."
  4. "Be my guest."
  5. "Have fun with your friends."
  6. "I'm glad you like it."
  7. "I'm glad you had fun."
  8. "If you're happy I'm happy."