five o'clock power

When a batter is only good during batting practice.

Wow, did you see that bomb? Mike can sure hit the long ball!

Please, Mike only has five o'clock power. This season he's batting .170 and yesterday he was 0-for-4.

paper canoe

When a joint burns on one side only.

Hey man, looks like we've got a paper canoe on our hands, let's squash this shit out and roll a new one.