1.   The idea sounded crazy to me.

2.   The whole idea sounds plumb crazy to me.

3.   And the fans are crazy to boot.

4.   As much as I hate shopping and as wonderful as the Internet is, the whole idea of buying books online seems a bit crazy to me.

5.   He said it sounded crazy to him.

6.   If that idea sounds crazy to you, then you are not in touch with reality, European style.

7.   They would be crazy not to.

8.   What is crazy to one person is perfectly normal to another.