Most cited paper of all time …

Would be Fisher’s if people cited him every time they used a p value:

The p-value is the most widely-known statistic. P-values are reported in a large majority of scientific publications that measure and report data. R.A. Fisher is widely credited with inventing the p-value. If he was cited every time a p-value was reported his paper would have, at the very least, 3 million citations* – making it the most highly cited paper of all time.