Oh, I just remembered, I left the stove on, I must run.

Someone's at the door, must dash.

Are you still there ?, your breaking up, the battery must be going on this phone.

My mum/dad/sister/brother/boss is on the other line.

Can you hear that, I think we must have crossed line, I'll call you back in a while.

I've got to go. I can't keep talking, I have to keep the line open for an important call.

I have to go put a quarter in the parking meter.

Someone's trying to ring through on "call waiting."

My spouse forbids me to discuss such matters. Don't say another word.

I heard a click and I think we're being bugged. I'll call you when I've had the office swept and I know it's safe.

Stop right now. You're getting into a topic that I'm writing about and I don't want it ever said that I stole ideas from you.

I learned in time management classes that all important information can be conveyed within three minutes. Your time is up.

Talking is unecological, it uses up too much oxygen.

Talking is so unevolved, let's try telepathy.