Some things I know off the top of my head.

- One KFC Tender Roast Combo with potato wedges and Code Red plus tax is $5.14
- Two Jr. Bacon Cheeseburgers and a sour cream 'n' chives potato plus tax is $3.19
- or Two Jr. Bacon Cheeseburgers and a small Frosty plus tax is $3.19
- Fazoli's Four Cheese and Tomato with two breadsticks and water plus tax is $3.21
- Kneaders Classic Turkey on Fococcia plus tax is $5.78

Some things I don't know off the top of my head.

- The price of anything from the meat, produce or dairy section of a given supermarket
- Calculus
- How to "brown" hamburger
- Why people like the Counting Crows