What Am I Riddles

Question: What white coat lights up and is hot to the touch?

Question: What has 18 legs and catches flies?

Question: What can you serve but never eat?

Question: Lose me once, and i’ll come back stronger Lose me twice, and i’m gone forever What am I?

Question: When I come in, someone else leaves, I know everyone, yet no one knows me. I'll meet you all only once in your life, Causing mayhem and mischief and sorrowful strife. What am I?