sometimes yvyrythyng

isobel:~ adam$ perl -le 'for $c ('a'..'z') { $_ = "everything"; s/[aeiou]/$c/g; print }'
avarythang
bvbrythbng
cvcrythcng
dvdrythdng
everytheng
fvfrythfng
gvgrythgng
hvhrythhng
ivirything
jvjrythjng
kvkrythkng
lvlrythlng
mvmrythmng
nvnrythnng
ovorythong
pvprythpng
qvqrythqng
rvrrythrng
svsrythsng
tvtrythtng
uvurythung
vvvrythvng
wvwrythwng
xvxrythxng
yvyrythyng
zvzrythzng