What sort of nails did the tough kid who swallows nails swallow?
I'd always though it meant metal nails (for nailing wood), which would indeed be tough, but also pretty masochistic, and probably fatal so not something to be done repeatedly (or 'sometimes'). I've always been confused by the line.
It's only just occurred to me after 20+ years that it might be fingernails, which is far more realistic, but really not that tough. Especially for someone who killed a policeman.
What nails did Morrissey actually mean?