I know I laugh at him but, joking aside, he's a very clever scientist.I know I threatened to leave and go round the world, but, joking aside, I need a vacation.

I wish you wouldn't make light of his problems. They're quite serious.I make light of my problems, and that makes me feel better.

It's no joke when you miss the last train.It's certainly no joke when you have to walk home.

No kidding, you really got an A in geometry?I really did, no kidding.

Be serious. This is no laughing matter.This disease is no laughing matter. It's quite deadly.

Billy, get into this house and do your homework, and I mean business.We mean business when we say you must stop all this nonsense.

John took the criticism to heart and made an honest effort to improve.I know Bob said a lot of cruel things to you, but he was angry. You shouldn't take those things to heart.

All right, it's time to boogie. Cool it!The whistle blew. Time to boogie.

We sat down and had a nice heart-to-heart for about an hour.A little heart-to-heart talk is just what you need.

This is a very heavy matter.This matter is too heavy.I have some heavy things to talk over with you, Sam.

Man, that meeting was really a heavy scene.Another heavy scene like that and I quit.

She is a great singer. I kid you not.I kid you not. This is the best.

Get over here now! I'm not kidding.I'm not kidding. It was this big!

That man is so intense!This is an intense matter.Oh, wow! Now that's what I call intense!

Stop laughing! I mean business.I could tell from the look on her face that she meant business.

Mary couldn't stay straight-faced very long. It was just too funny.He was a very straight-faced prof, but he has a tremendous sense of humor.