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"The word EFFERVESCENCE is unusual because E's are spaced out in it. It has 13 letters, and E's appear in positions
1-4-7-13.

Now, think a familiar two-word phrase in 15 letters, in which the letter R appears in positions 1-4-8-12-15. These are the only R's that appear in them.
What word is it?"

 - NPR Word Quiz of this Week.

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Gee Bankroll, you'd think that a quiz about words would be consistent with their numbering instruction now wouldn't you?
But hey, it's only the effete happy cats at the NPR, give 'em a break.

Oh yeah, the answer is Refrigerator Car