1. Do I have a train / tank riding here? | A jedzie mi tu pociąg/czołg?
Accompanied by this gesture, it is a great reply when someone tells you something totally unbelievable. For example, “I’m going to run a marathon without even training for it” — to which you pull down your lower eyelid and retort, “Right, and do I have a train riding here?” It’s the Polish equivalent of “not gonna happen.”
Sometimes we say, “And do I have a cactus growing here?” and show the palm of one hand. It means the same thing (obviously, there is no train riding in your eye and similarly, no cactus growing in the palm of your hand).