ENT did a little bit of body horror with the transporters since they were still new in-universe. One of the away team was beamed up during a storm, and some branches and leaves blew into the beam and became integrated into him when he rematerialized. He got better.

I’m hazy on the specifics, but in DS9, someone sabotaged the transporter and the contact they were supposed to meet burned alive during rematerialization. That was pretty gory for Trek.

Galaxy Quest went all the way and turned the pig-monster inside out lol … and then it exploded.