Not quite as binding as Newton's Laws, these are my own observations of unfortunate truisms of the last four months.

1) Punctures usually come two at a time, close together.

2) If you think a day is going to be tough, somehow it will become tougher.

3) If there's oatmeal for breakfast, the day will be tough.

4) If ever there is a buffet on offer, consider no other place to eat.

5) A clean piece of clothing will always be soiled embarassingly (spilling food on your crotch) within a few hours of wearing it.

6) Any promised animal sightings will probably not happen. (Conversely, any animals never mentioned will most likely be seen.)

7) The sun will come out just long enough for your tent to dry completely before it gets completely soaked again.

8) The only days on which you can't find your fork are those when spaghetti is served.

9) The day you skip lunch will be a day when lunch is especially good.

10) The days you decide not to put your rain fly on are when it will rain.