We often imagine ourselves as the fellow Eric Heatherly sang about in his hit "Flowers on the Wall." Now, we've never smoked cigarettes while watching Captain Kangaroo or played solitaire until dawn with a deck of 51. But we often eat alone, and most times we find ourselves at Joe's Pizza, eating cheap, hot slices. Tucked in the back of that den of drunkenness known as Kelly's Westport Inn, Joe's never triggers our inner lonely boy. The tiny pizza shop keeps us coming back for lunch with $1.25 slices (Tuesdays and Thursdays until 2 p.m.); a slice, a salad and a large drink for $5 (Mondays); or two slices and a drink for $5 (Wednesdays). Maybe we like the chill vibe, with ESPN playing on the tube and no one hassling us while we read the paper. Maybe it's because even a single slice is still just $2.25 (sausage, pepperoni or cheese) or $2.50 (all meat, combo or veggie). Or maybe we just like checking out the punk girl working the counter. Whatever hold Joe's has on us, we can't quit going back, even if we're by our lonesome. Just don't tell us we've got nothing to do.