Sandwiches

    I've known this all my life.  And if you cut (or tear) the very top off - you know, where they put nuts or other assorted junk on - it's another 10% better.

    Don't get me wrong, you don't have to remove all four sides of the crust.  Just the top part.

The drawbacks of Time-Travel

    And just try using your cell phone in the Mesozoic Era.