Cruise down Lower Greenville any given Sunday and you'll hear the distinctive brrruub-brrruub-brrrrrrrruub of big bad motorcycles. And they're all headed one place: The Blue Goose. For hours, the bikes--choppers, hogs, you name it--are lined up outside the Tex-Mex restaurant as their riders carouse over tacos, enchiladas and festive libations. But these often leather-clad folk aren't the only two-wheelers looking for a little Sunday afternoon camaraderie. Around 2 or 3 p.m., another distinctive sound can be heard. It's the higher-pitched whirrr indicative of a scooter--a Vespa, a Honda Metropolitan, you name it. The mod squad begins to show up, stylishly dressed, in numbers not quite as large as their meatier opponents, for pints and the occasional Welsh rarebit at The Dubliner. Even with rarely a shout lobbed between the opposing motor squads, Sunday is all geared up (ba-dum-dum) at the Greenville cantina and the Irish pub.