More fun than Mayonnaise... or at least equally fun... OK, it's less fun, but you're still reading...
Shredding
I just shredded all of my savings account, checking account, credit card statements and receipts from before 2000. After compating it, shreddings fit nicely in a "tall kitchen" (10 gallon?) bag. One third of shredding snowman complete.
Tires
Road my bike to work after 18 months of talking about it. Took 2 minutes longer, wasn't sweaty when I arrived and could potentially save $7/week in gas. That's a free burrito!