You'd be surprised how many C or C++ programmers don't know about UB. Some (I've worked with one of them) even went so far as to say »I know what assembly the c

You'd be surprised how many C or C++ programmers don't know about UB. Some (I've worked with one of them) even went so far as to say »I know what assembly the compiler generates from that, even if it's UB I know how it behaves.« And those people then wonder that their code does something differently when moving to a new compiler version, or when switching to a different compiler.