He laughed, as if the idea amused him.

But this idea amused the General so much that he nearly rolled off his chair laughing.

"The idea of Craig sleeping on a couch in his own house amuses me," Barbara said.

Nick smiled as if the idea amused him.

Then for a few hours the idea of his actually writing a book had amused him.

He found that the idea amused him.

For a moment, the idea amused him.

He chuckled again, as if the idea amused him.

The idea that it could be "repurposed" as a non-arts building amused me vastly.

The idea amused him a little, but not much.