FORESIGHT: Just as well I didn't bet him

Last Wednesday evening I asked the Young Relative if he thought school would be cancelled the next day.
"Yes," he replied calmly. "I guarantee it."
Normally I would challenge such an assertion from the youth, suggesting, perhaps, that he put his money where his mouth is, but this time it's wise I didn't: school was cancelled not only for Thursday, but for Friday as well. Being the sharp character he is, he probably would have insisted I pay him double the wager.