(To the tune of: There's a hole in my bucket)
Me: I've made a correlation matrix (grid), using Pearson's correlation coefficient (r), for a selection of variables, using my trusty statistical software SPSS.
Statistician: Yes, well done, but having done that, some of the variables are not continuous, so you should use Spearman's rho correlation coefficient (ρ).
Me: No problem, how's this?