Castellaneta's normal speaking voice does not bear any resemblance to Homer's. To perform Homer's voice, Castellaneta lowers his chin to his chest and is said to "let his I.Q. go". While in this state, he has ad-libbed several of Homer's least intelligent comments, such as the line "S-M-R-T; I mean, S-M-A-R-T!" from "Homer Goes to College" (season five, 1993) which was a genuine mistake made by Castellaneta during recording. Castellaneta likes to stay in character during recording sessions, and he tries to visualize a scene so that he can give the proper voice to it. Despite Homer's fame, Castellaneta claims he is rarely recognized in public, "except, maybe, by a die-hard fan".