I accepted an offer from a small firm earlier this week. However, today a firm that I contacted some time ago got in touch with me about setting up an interview. All things considered I'd probably rather work for Firm B but I haven't interviewed much less received an offer. If I do receive an offer and the pay is significantly better would it be completely stupid to renege and go to work for Firm B this summer? I'm thinking of the bridges that I might burn and things such as that.