Never heard of that one...

Doing an alphabet puzzle with Breanna, she had to tell me all the words she could come up with that started with whichever letter she picked up randomly before it could go in the puzzle.  When we got to "o", she said "ostrich," since we had just done an animal puzzle.  When I picked up "r," she said, "rrrr."  I said, "Yes, it says rrrr, but what words start with rrrr?"  She thought for a minute, and then said with a big smile, "Rstrich."