\documentclass{article}
\usepackage{xparse}
\ExplSyntaxOn
\seq_new:N\l_dc_blame_seq
\seq_set_split:Nnn\l_dc_blame_seq{,}{@egreg,@paulocereda,@josephwright,@frank,NOT~MY~FAULT}
\NewDocumentCommand\blame {}
{
\seq_item:Nn \l_dc_blame_seq {\fp_eval:n { randint( 1, \seq_count:N\l_dc_blame_seq ) }}
}
\newcommand\showblame{\fbox{\makebox[3cm]{\strut\blame}}}
\ExplSyntaxOff
\begin{document}
\section*{Blame Slot machine}
\showblame\quad\showblame\quad\showblame
\end{document}