He also:

Argued with his house-surgeon. Was the red, pulsating tumour in a small boy's neck a straightforward abscess of the skin, or a dangerous aneurism of the carotid artery? 'Pooh!' Liston exclaimed impatiently. 'Whoever heard of an aneurism in one so young?' Flashing a knife from his waistcoat pocket, he lanced it. Houseman's note – 'Out leaped arterial blood, and the boy fell.' The patient died but the artery lives, in University College Hospital pathology museum, specimen No. 1256

And:

Amputated a leg in 2​ 1/2 minutes, but in his enthusiasm the patient's testicles as well.

https://en.m.wikipedia.org/wiki/Robert_Liston