Him, teachers, parents, and just about any other authority figure.

Of course Roscoe won't believe you...

And the jerk will take all the credit at the end when you find out "Old man jefferson did it"

Also when you tell him he'll be all sarcastic and patronising "Oh your coat tried to strangle you? Oh No, we better get a search warrant out, there might be a killer sweater out in somebody's laundry somewhere...."

And then you can hear him and the deputy laughing at you as you leave/listen down the phone.

I wasn't interested in this list until I found this one. There must be a school that trains actors to be the sheriff that never believes there's a killer on the loose I must admit, I watch a lot of movies but I missed this cliche. In all of those movies, the chaste chick comes in with bug-eyes, dirt, and blood all over but Buford T. Justice never believes a word she says.