Answer:
What do you get when you cross a cow with a trampoline?
I'm as simple as a circle worthless as a leader; but when I follow a group their strength increases tenfold. By myself I'm practically nothing.
What do you call a bear in the rain?
When it comes to me, you go on red and stops on green. What am I?
I am the ultimate killing machine used not once but TWICE I can be made by humans.
When is it bad luck to see a black cat?