Prehistoric?? What pops into your head straight away??

Ok so i was just thinking up some stuff, no i'm not giving details however i was searching images for some megalodon tooth photos and there was the word prehistoric. Straight away i thought of Spinosaurus. What do you think of when you read or see the word???? And also which prehistoric creature do you think could still be roaming the earth??

Hmmm......the stereotypical dinosaur the T-Rex, due to the mass conception of its strentgh and unusual speed and fiericity. Guess Jurrasic Park too

Strange, my thought was a cave with 10 hot looking cavewomen in really short skins.