It's a bird...

The lambs will often gather randomly and race back and forth.  The game will end as quickly as it begins.  Sometimes, one will jump over an "imaginary" obstacle and every one else will follow suit.  I wish I'd got a better angle here.  This one got some good air!

I don't tell a good joke but "there is the one" about the teacher who asks her class "if there are 10 lambs in the pen and one jumps out, how many are left?"  The farm kid responds "none".  When the teacher tries to explain his error, he stands by his answer....insisting that if one jumps out, they all will.  True!