Liem being helpful

We are busy packing our suitcases to head home after spending Christmas with Liem's grandparents. Then we hear Liem say, "I wanted to pull my suitcase to your room but everything fell out". Mummy finds clothes and toys that had been packed nicely in his suitcase now strewn on the floor. Mummy sighs, "Why didn't you zip your suitcase before you pulled it?"