A train just leaves a station and enters a tunnel. Where is the best place for a claustrophobic person to sit?
Answer:
In the back. See, the train is still accelerating as it is leaving the station so the train will be moving faster when the back of the train enters the tunnel.
I appear in the morning. But am always there. You can never see me. Though I am everywhere. By night I am gone, though I sometimes never was. Nothing can defeat me. But I am easily gone.