Answer:
What is yours but only used by others?
Three doctors said that Bill was their brother. Bill said he had no brothers. Who was lying?
How is it possible to always find what your looking for in the last place you look?
The yellow house has yellow window, the red house has red windows, what colour windows does the green house have?
What can you stick between a 3 and a 4 so that the result is more than three but less than four?
Born in the ocean and white as snow. When I fall back to water I disappear without a trace.