Who gave SWI-Prolog a sense of humor?

Question

Who gave SWI-Prolog a sense of humor?

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1 ?- Input.  
% ... 1,000,000 ............ 10,000,000 years later  
%   
%       >> 42 << (last release gives the question)
1 ?-   

Answer 1

Jan Wielemaker at The Beginning of Time! (Time!...Time...time...)

Commit 97f1b0bbcedbb7598775a40caacbe16f139f28d8 on May 26, 1992:

$execute(Var, _) :-
    var(Var), !,
    $ttyformat('... 1,000,000 ............ 10,000,000 years later~n~n'),
    $ttyformat('~t~8|>> 42 << (last release gives the question)~n'),
fail.