Andrew Llewellyn, 34, pictured at home near Bridgend, Wales. Andrew realised he had a brain tumor when he started to be unable to tell jokes and his personality changed. See SWNS story SWJOKE; A man known for cracking jokes discovered he had a brain tumour the size of an egg – after losing the ability to be funny. Andrew Llewellyn, 34, used to be the centre of conversation and loved telling one-liners and stories to friends and workmates. But he then found he could no longer remember his favourite jokes or find the words to make funny remarks. He went to his GP who ordered further tests and as he waited for them Andrew suffered a huge seizure on his stag do.