My girlfriend would probably have said me. But in all actuality, we traveled light, so we didn't have much useless stuff when went to India. I think my cashiers checks were unnecessary, since I really did not feel at risk of theft. I know it is always a concern, but we were smart with how we acted and had our own guide with us when we went out and about. The checks gave me peace of mind, but were ultimately unneeded.
I would say that a lot of this has to do with where you go and what you want to achieve. Someone mentioned bringing hiking boots, but I took a pair because I went up North, into the foothills. I wouldn't have made it out of the car in my loafers. My GF brought her water bottle, which I thought was silly, but it worked out well for her because it strapped so easily to her backpack.
Honestly, the most useless thing to bring is a preconceived notion. India surprises you. For a man born and raised in the US, India was the most diverse and fascinating destination I have ever visited. We have an idea that a country is a monolithic entity, yet really, in the case of India, it is hundreds of unique cultures, places, landmarks, all drastically different from what you could imagine. Go there expecting to be blown away.