Too Short

In R & D Department, I was the shortest in the group.

One day when one of my colleague - HC wanted to take photo of us behind the partition, they all just put the head on the partition, but my head only can see half of it. So, HC asked me to put my head on the partition, and I told her that it was my limit even I tiptoe...... Then, they all just laughing!!

Why?!! Why?!! Why I'm so short??!! ( T^T)