No, not yesterday. But I DID once do a triple-fail over the Passover holiday a few years ago, when I had a Monte Christo sandwich: leavened bread, ham, and cheese!
Truly keeping kosher is amazingly difficult.....and expensive...... I had an old boss who studied the Torah some years back, and apparently the literal translation is something to the effect of " you shall not eat the lamb's meat cooked in the mother's milk." It was probably a caution for sanitary reasons, meaning the milk could spoil the meat or something. But it grew to mixing ALL dairy and meat. <-- Could be wrong, but I don't think my boss was joking.....