Whenever my motivation wanes, I just try sitting in traffic for an hour, listening to crappy morning DJ banter and then pay $20 for parking. If that doesn't work, I get on the bus and sit next to a teenage girl on her cellphone, talking like she's an auctioneer about how Britney Spears became such a ho.
After that, riding in pitch black, -20c and 20cm of snow, feels like heaven.