Where's the titanic?

Years ago, one of my great-uncles was known for taking off from home and staying away for weeks or months at a time. While he was away, he would often run up gambling debts and the loan sharks would visit his wife, Lizzie, who was waiting at home for her husband to return.

Lizzie got sick of these men visiting her, asking for money to repay her husband's loans. On one occasion, yet another debt collector visited her home, again asking for money and asking to know the whereabouts of her missing husband. Lizzie responded with a classic response that has lasted in the family memory long after her death. In exasperation, she told him, "He's up a shark's arse, looking for the titanic!"

An irreverent but pretty funny saying!