Typing IP addresses + gateways + DNS servers.

Also, numerical operations / form filling while consuming liquid or holding a pet. It's surprising the number of times the ability to perform even a subset of tasks while not having both hands to dedicate has allowed me to maintain focus and interest instead of stopping dead and having to spool back up slowly.

> Because that's where it should always be.

I must admit, I have yet to figure out how to maintain this discipline while whiteboarding, let alone walking, or sleeping.