What did Valli see on her way that made her laugh?

Valli saw a young cow whose tail was high in the air, running very fast right in front of the bus in the middle of the road. Valli started clapping in glee. The bus slowed and the driver sounded his horn loudly over and over again. However, the more he honked, the more frightened the cow became and it kept running faster and faster, right in front of the bus. Somehow it was very funny for Valli and she kept on laughing until she had tears in her eyes. At last, the cow moved off the road.

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