This sentence has three As, two Cs, two Ds, nineteen Es, six Fs, two Gs, five Hs, ten Is, two Ls, twelve Ns, nine Os, five Rs, twenty six Ss, sixteen Ts, four Us, four Vs, eight Ws, four Xs, and two Ys.
How many other similar self-referential statements can you come up with (there exist a relatively small finite number of possibilities)?
By all means see: METAMAGICAL THEMAS by D.Hofstadter p.27.
I am too lazy to copy but there are several pearls there. Especially I like the one starting with:
" Only a fool would take trouble to verify that this sentence was composed of ten a's, three b's......."
"yields falsehood when appended
to its quotation " yields falsehood when appended to its quotation. (SAME SOURCE)