You pretend you've ever read these books, but all the other kids say they're so freakin scary so you never have. It's in your backpack because you rented it from the school library to look cool. You have not opened it. Teacher asks "what's your favorite scary story?" And you say "goosebumps" because you don't know any other scary books, and when that one kind of goth kid asks "oh which one?" you're super intimidated because he's hella cool and never talks to you, so you just tell them the story of Bloody Mary and he goes "omg that ones soo scary that's my favorite one too. Have you seen the TV show? So scary" and you lie and say "yah. Every week."
I have still never bothered to read a Goosebumps book and I have a hard time believing that even half of us did.