any birthday/anniversary presents for a teenage boy you just cant go wrong with?

[Anikinz]

i have always had problems with buying stuff for my bf or any guy in my life really.
what are some foolproof present ideas?

oh and an edit cuz i just asked him
he would prefer if i made him something instead of buying

[snow_girl]

A cd or music store gift certificate usually goes over well....or at least it did when I was growing up. Maybe a video game?