"[...] Besides... where Rincewind went" - he lowered his voice - "trouble followed behind." Ridcully noticed that the wizards drew a little closer together. "Sounds all right to me," he said. "Best place for trouble, behind. You certainly don't want it in front."
Interesting Times: (Discworld Novel 17) - Terry Pratchett

Interesting Times (Discworld #17) by Terry Pratchett