I did this too. Traps, encounters, and various locked door type situations that were incredibly dangerous. The players would find some way out, and usually in a way I didn't think of. Any attempt at cleverness on my part would cheapen the experience. I just stuck to trying to kill them- thoughtfully
SGW
D&D Confession: sometimes I create elaborate puzzles for my players with no pre-planned solution and then I just let them come up with increasingly complicated solutions until they make one I like.
It's a win win. They feel brilliant and you don't have to learn 17 languages to make an arcane pun.