Muddy foot

Login remotely to mum & dad's computer and fix it: check
Go into town and buy something for lunch: check
Look at Ms GW's Facebook photos and videos: check
Talk to Ms GW in Miami: check
Take dogs for long walk around park: check
Make and eat lunch: check
Settle back on the lounge and watch the rugby in hi def: check
Now, how did I get this muddy foot?