Smells

They say your sense of smell has the strongest memory of all of your senses.  It's true, too. 

I bought some of this to polish my hinges.

As soon as I opened the can, I was right back in Navy boot camp, polishing the garbage can with a recruit named Frechette. 

I was there, in the compartment, with the sounds and the smells, and hearing her telling me to hand her the Nevr-Dull.

It was uncanny how completely it all came back to me.