Urgent! I need a clever joke (anything) ... thanks.

Luo went to Gu Dadu's home and worked long hours. On the first day of work, before dawn, Gu mostly got up early and told him to work in the fields, but after waiting for a long time, Luo didn't come out, and then he shouted impatiently. Luo said, "I got up early and was busy catching lice." Gu Dadu said, "Nonsense, it's not dawn yet. Can you catch it in the dark? " Luo asked, "since I can't catch lice, can I see it when I work in the fields early?" Gu was mostly asked dumb.