Dike is something a Dutchman puts his finger in.
Dyke is a woman who eats carpets.
Well... Everytime I drive down to Folsom Dam's "Dike 8," I keep forgetting to look how they spells it!!! I could go on, but I won't...
The first year I taught pre-k, I sent home a newsletter telling the parents what we did during the week. I put that we read The Little Boy and the Dyke, instead of Dike. Spellcheck recognizes both. Needless to say I had some very concerned parents. Very embarrassing.