pneumonoultramicrscopisilicovolcanoconiosis

The longest word in the English language (pronounced ne-mon-e-o-all-tra-mike-row-scop-ic-sil-ico-vol-cay-no-cone-e-o-sis)

Bend Dover "can you say Pneumonoultramicrscopisilicovolcanoconiosis?"
Moe Lester "stop it you are hurting my brain."