Litterbugs

Child : Why is there so much garbage in the street, Mom?
Mother : Because there are many litterbugs.
Child : What are litterbugs?
Mother : They're people who don't put their rubbish in trash cans.

小孩:妈妈, 为什么街上有这么多垃圾呢?
母亲:因为有很多垃圾虫。
小孩:什么是垃圾虫呢?
母亲:就是那些不把垃圾丢在垃圾箱里的人。