Premise: a violist playing next to an advertising sign

Hypothesis: A violinist plays the flute next to an advertising sign.
no

Premise: Half naked man leaning out of window taking pictures.

Hypothesis: A half naked man is taking pictures for later use.
it is not possible to tell

Premise: Friends or family joined together at a barbecue.

Hypothesis: A grizzly bear disrupts the barbecue.
no

Premise: A man in a yellow shirt and striped pants is sitting at a small table outside.

Hypothesis: A man is sitting in his living room.
no