Some things that may be considered "bad" could be:
Pessimistic is a synonym for something bad happening. It begins with p.
pants
Pina Colada
pontoon boat
Pensacola is a city in Florida.
A synonym for "strange" that starts with the letter "p" is "peculiar." It refers to something that is unusual, distinctive, or different from what is normal or expected.
Pinehurst is a golf resort in North Carolina. It begins with the letter P.
A praying mantis starts with the letter p, and a pill bug does too
Golf tees are made out of wood. They begin with the letter t.
Potatoes are veggies. Potato starts with p. :)
Pagliacci. Poison. Pale, pasty pancakes. P-death, P-sorrow, P-mourn. Getting kicked in the pee-pee! XD
A basketball term that starts with P is pass.