The context of the following conversation is Casey was proud to see Bailey get perfect grades and urged the shy Bailey to accept an award.:
Casey says I'm so proud of Bailey.
The friend responds What has he been up to this time.
Casey responds Could you imagine he got perfect grades in school.
The friend responds You mean Bailey could achieve good grades, and here I am thinking he was a joker.
Casey responds Believe it or not and he was too shy to accept his award.
The friend responds Such a nice guy.