Here is one more to crack your brain :-p
A person is suppose to transport A Dog, A Cat and Milk Can across the river using a boat.
While transporting, The boat can occupy only himself and any one from the rest. How did he transport all of them without making the Cat as prey to the Dog or the Cat drink the Milk Can?
I think some of you might have already come across this answer, If so please let the fresh thinkers answer this question