If you find yourself wandering South Congress and hear laughter, toasted shots and unguarded renditions of “Sweet Caroline,” you might be near Ego’s, a dive bar and karaoke institution that has welcomed locals, visitors and even Texas politicians to the mic since 1979. Tucked under a building behind a gas station, Ego’s feels like an old secret that every Austinite wants to share and one that newcomers delight in discovering.