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##PHP, 144 135 130 120 272 220 bytes

<?php $e='$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='<?php $e=%c%s%1$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:

<?php $e='$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='<?php $e=%c%s%1$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);