Dwight's was recommended to me by a Cajun in Lafayette. It's about four miles from downtown Lafayette. An alternative suggestion was Don's, which is more upscale, has a full bar, and a larger menu. Dwight's serves only beer, and is clearly the more Roadfood-esque of the two. My experience was fabulous. The clientele is almost exclusively locals. According to Brittney, my wonderful server, Dwight's is only open during crawfish season, roughly January through May.
Three pounds of boiled crawfish cost $13. I chose the hot and spicy preparation. Brittney pointed out that other diners that evening found it too hot and had to wash off the spice. I found it spiced just right. If hot isn't hot enough, the crawfish is served with horseradish and mayo, and there's a variety of hot sauces on the table.