I have to take my brother to baseball practice.

The most annoying excuse ever. You're not going to baseball practice. You're just using your brother as a shield.

I have to take my brother to baseball practice. I can't go to the mall with you.

I have to take my brother to baseball practice. I can't help you cheat on your math test.

I have to take my brother to baseball practice. I can't help you fight your dad.