this reminds me of the time when i once had Hippopotomonstrosesquippedaliophobia and was diagnosed with pneumonoultramicroscopicsilicovolcanoconiosis, and once also visited the Chuch of Antidisestablishmentarianism
For my school being able to say pneumonoultramicroscopicsilicovolcanoconiosis and llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch and crap is still cool
Here's a very long one
Goolgolmonopinexasoupinegaxnobrecallspoonjointgernimoctenminopinserpentponerblasthreeaspolaxchialidosuswaspinbreadinexpalidosausagenumarskinonenterfiseraticextrous.