Answer:
I walk on 4 legs in the morning, 2 legs at noon, and 3 legs at night. What am I?
What body part is pronounced as one letter, but written with three, only two different letters are used?
Always in you, sometimes on you. If I surround you, I can kill you. What am I?
I cannot be felt, seen or touched. Yet I can be found in everybody. My existence is always in debate, yet I have my own style of music. What am I?
I'm an animal. I love marching. I always wear a tuxedo. What am I?
When is it bad luck to see a black cat?