Try Carl's Subs. It's a great sub shop at 2208 Rhode Island Avenue NE (Woodridge). Lunchtime is crowded but worth the wait. Our favorite is the #9. Check the place out and you'll understand.
Disclaimer: Best of Washington DC T-shirts and Gifts is not affiliated with the sub shop. (They don't even know we're writing about them.)
Woodridge White T-Shirt