I've always found this so odd. Passports are so often stamped on random pages (or not stamped at all) that I wonder how the border guards make heads or tails of

I've always found this so odd. Passports are so often stamped on random pages (or not stamped at all) that I wonder how the border guards make heads or tails of them. But I guess all that matters is that the guards in that country understand their own system.