Three keys carefully tapped out
remove doubt and make it clear—
this a joke, but that a frown.
Tiny clown, bring drear or cheer.

For some, two keys shall suffice;
but to be nice, make a nose—
'tis just a dash more trouble,
but hath double the fair pose.

Of course, we can't forget one:
for fun, the twice-dotted Ü
(although too tall and too thin)
is a good grin, fresh and new.