Well...I almost got Ben like 3 things on this list...I know this list doesn't apply to all guys, but seriously...lol...I used to brag about being such an amazing gift giver!
Key chains. Women have purses, filled with many wonderful and convenient things to have on hand. Sometimes that makes keys hard to find so a keychain helps though we have pockets. All that's usually in them is a wallet, keys, maybe our phone or some loose change. We're not going to lose our keys and we don't want weirdly shaped plastic poking our thighs.
Things "as seen on TV!" Generally speaking, we'd rather see it on TV and chuckle than own whatever wacky contraption those late-night commercials are hawking. If it were more useful or worthwhile, it would probably be seen in stores not just on TV. and it wouldn't need someone describing it by talking way too loud and way too fast.
Shoes and clothes. Clothes aren't fun for most guys. It's true we probably don't buy new clothes often enough. We wear our favorite jeans until they're rags, and wear our loafers until they fell apart, if our parents didn't buy me new ones every year. But fun? No.
Artwork. It can be even more difficult to tell our taste in this area, since we don't wear it around. Unless the guy has expressed a specific interest, take him with you when shopping for art.
Jewelry. Shocker: Not a big thing for most guys. If you don't see them wearing it, the reason is usually because they don't want to or they never considered it. If they're willing to try, think simple and probably silver.
Cologne. Unless you're 1,000% sure they wear it and the brand, this is a big no-no.