There is a decent thong slip in the movie "She's Out of My League". Towards the end of the movie the main character is running from he's crazy girlfriend who chases him through the airport. Her thong is popping out of her jeans for a decent portion of the chases and it sticks out quite a bit.
In the movie "Hostage" the daughter, who is one of the main characters, has various thong slips out of her tight jeans. This one is a personnel favorite of mine.