Two blondes were walking through the park digging holes and filling them up again.
One of them would dig the holes, and the other would fill them up. One man couldn’t control his curiosity and asked the blondes why they were digging and filling holes pointlessly, to which one replied:
“Well, there was supposed to be another one of us planting saplings before we fill the holes, but she couldn’t come so we’ll have to make do without her.”