After Simon dumps Robin for the second time, she is humiliated.
The name of Simon's band is a classic HIMYM double entendre. [S3E16] Sandcastles in the Sand
"Sandcastles in the Sand" is an 80s-style power ballad. After Simon dumps Robin for the second time,
Barney is the one who goes to her apartment to cheer her up. [S3E16] Sandcastles in the Sand