You have a set of rules
These are the rules you made
The rules you live by
And they are very important
They are not in any particular order
That depends on you
Whatever sequence you can remember your rules in
That must be their arrangement
At least
Until further notice
Right now the first one is 'always remember that,
Even though you love Science,
It can sometimes be more fun to just forget it even exists'
Next is 'don't talk about The Beatles being classical music
At least, not around Barbara'
Then comes 'try anything'
And then there's 'If it starts to get boring
It isn't worth your trouble'
The Doctor doesn't have rules
You decide that he should
You teach him to just make them up
As he goes along
And Vicki…
…he still does