all day long i have been saying "happy thinko de mayo!"
i learned a little spanish in SPAIN and they pronounce the "s" sound as a "th".
the story goes: they had a leader that had a lisp and so the people of spain were told to speak like him in order to make him NOT feel uncomfortable.
"we thay in thpanish uno, doth, treth, quatro, thinko!!!! happy thinko de mayo!"