In the beginning

If you phone me and I don't answer

 It might be that I am sleeping

It might be that I am at work

Be equally 

I might be that I have gone Gongoozling.

Gongoozling "the activity of watching boats and activities on canals (= long, narrow, artificially made stretches of water), for pleasure: Gongoozling in many ways is similar to trainspotting."

.......with my dog.