Personal favorite is probably Lamarckian Inheritance. Feels like super buff people having wimpy ass babies would key people in that acquired traits weren’t being passed on.
But it’s also the textbook example of how science progresses even when the underlying model being used is incorrect. Darwin credited Lamarck for suggesting a potential mechanism for evolution. Works prior to Mendel were direct tests to Lamarckism. Mendel responded to those, and on and on it goes. Lamarck helped push the field along and that’s great.
Side note, people like to say epigenetics is a continuation of Lamarckism but I’d disagree completely. Heritability of traits is what is important here, and epigenetic marks don’t necessarily tag the genes that contribute to the traits themselves.