You're walking by the side of the road and you're hit by a truck, or you're trying to to jump on a moving train, you're late for work, and your pant leg gets caught.
Mungkin orang itu  berjalan di tepi jalan dan dilanggar trak, atau cuba melompat  ke atas kereta api dia lewat ke tempat kerja,  dan kaki seluarnya tersangkut.