As I drove home last night I actually said this out loud rather dryly, "well that was self-fulfilling prophecy".
Normally I have a mantra I say to myself before class to get my head straight. I do this while I'm sorting out my gi, belt and water for class. It's basically this, "don't take it personal, you need this exercise, don't fear injury, but be careful, etc." Although I say this all the time before class it really hasn't come true to any degree in a long time. Last night broke that healthy stretch, but thankfully it appears to be nothing more than a painful sprain of the big toe.
I'm hobbling around today, but I don't feel any of that lingering frustration about class or myself that attends a "bigger" injury. Hopefully I'll be at class on Tuesday.