Sod's Logic

The use of Sod's Law to one's own advantage.

Used Sod's Logic today. Really didn't want it to rain on my picnic today, so I brought an umbrella with me.
OR
I really want this person I fancy at work to talk to me. Today I didn't wash, do my hair or wear clean clothes and I'm hungover. 99% guaranteed today's the day they start speaking to me.