Catullus 17.12-13, 21-22 (tr. F.W. Cornish):
The fellow is a perfect
blockhead, and has not as much sense as a little baby
sleeping in the rocking arms
this, my booby
what he himself is, whether he is or is not,
he does not know so much as
insulsissimus est homo, nec sapit pueri instar
bimuli tremula patris dormientis in ulna.
talis iste meus stupor nil videt, nihil audit,
ipse qui sit, utrum sit an non sit, id quoque nescit.
21 meus codd.: merus Passerat
Hat tip: Eric Thomson.