Friends of ours have a young son that is still working on his speech. He likes to talk too fast and sometimes (and with particular letters) he can't pronounce them correctly. Our favorite is his pronounciation of "dump truck". There have been many occasions of driving down the road or walking through the toy store and his super excited voice he's like "hey look at the dumB Fu*&" We try and correct him and make him say it correctly right after he does it, but he just looks at you like your crazy and he's thinking "thats what I'm saying, dumB Fu*&"
Oh but he's not biased, he likes monster Fu*&s too!