## PHP, <s>144</s> <s>135</s> <s>130</s> <s>120</s> <s>272</s> <s>220</s> 212 bytes



    <?$e='$p=$n="";foreach(str_split($s)as$w)$p=$m[$p][]=$w;do echo$n=$m[$n][array_rand($m[$n])];while("\n"!=$n);
    ';$s='<?$e=%c%s%1$c;$s=%1$c%s%1$c;$s=sprintf($s,39,$e,$s);eval($e);';$s=sprintf($s,39,$e,$s);eval($e);

Or, formatted for readability:

    <?$e='$p = $n = "";
    foreach (str_split($s) as $w) {
        $p = $m[$p][] = $w;
    }
    do {
        echo $n = $m[$n][array_rand($m[$n])];
    } while ("\n" != $n);
    ';$s='<?$e=%c%s%1$c;$s=%1$c%s%1$c;$s=sprintf($s,39,$e,$s);eval($e);';$s=sprintf($s,39,$e,$s);eval($e);

**Sample output:**

    <?p=')ay_r_gecorr_splililen]=$p=$w;

and:

    <?p=$n=$ntststs$m[$n=$m[ay_r_chondo$n=$ph(s$nt(fitstr_r_geantentr_s('m[$n=$n"!=$p etstsp][$w;d(fililile(s$w)$nt(sphor_str_getrarast(''''m[$n='m[$m';

and: 

    <?p=$who eay_re($n=$n=$nt(')];d(fililileando et($m[]=$pleay_ch(')aray_ren='''))ay_st_r_s($m[$m[asp])ay_co$m[$p $phorentechitr_rean)][$n=$nd("\n"!=$n=$wh(filend('')ay_gen=$ndo$nt_rasp=$n][$p=$whp=$n='m[$n"\n)))))][$w;dorechph(';dorracho$ple_s$w;fil

and:

    <?ph($n);



**PHP Cheating, 117**

For the curious, if we cheat by reading our own source, we can do 117:

    <?=$p=$n='';foreach(str_split(file('m')[0])as$w)$p=$m[$p][]=$w;do echo$n=$m[$n][array_rand($m[$n])];while("\n"!=$n);