In Sibiu in Romania there is a bridge that has some interesting legends. It is called
The Bridge of Lies it is said that if a liar crosses that bridge it begins to groan and collapses.
What if Lois and Clark are in Romania together, probably to visit Dracula's hometown Sighisoara which is near Sibiu or they are investigating some strange murder cases where the victims lost all of their blood and had two marks on their necks...
Perhaps they are talking about the town and discover the legend of the bridge. When they come near that place Clark becomes nervous because he fears that the legend might be true.
Picture him avoiding the bridge or trying to float while crossing that bridge. Since there is magic in Lois and Clark's world what would happen if he actually crosses that bridge?
Why would he be afraid of that bridge? He has nothing to fear from an old legend, right?