Cannot create a row of size XXXX which is greater than the allowable maximum row size of 8060
SQL Server has a limitation of 8060 bytes per row. See "Bytes per row" in Maximum Capacity Specifications for SQL Server. Additional information for this line has this phrase:


  SQL Server supports row-overflow storage which enables variable length
  columns to be pushed off-row. Only a 24-byte root is stored in the
  main record for variable length columns pushed out of row; because of
  this, the effective row limit is higher than in previous releases of
  SQL Server. For more information, see the "Row-Overflow Data Exceeding
  8 KB" topic in SQL Server Books Online.


So, when you insert two varchar values each 5000 bytes long in one row, one or both of them would be stored off-row and occupy only 24 bytes instead of 5000+2. 

But, if you have 470 varchar columns in a table, you can insert only 8060/24=335 non-null varchar values in the same row of such table. In fact, even slightly less than 335, because there are other structures in a row that take some space. 

MSDN: Row-Overflow Data Exceeding 8 KB

So, to reproduce it in test environment, create a table with at least 336 varchar columns and try to insert 336 non-null values that are longer than 24 characters in the same row.