There are a few codes that do NOT unlock anything, but which make (funny) sound when entered them. Try them on result screen:
"Brb" - 957957957
"Break It" - 1+3+5+7+9
"Cry" - 531795
"Evil Laugh" - 1+7 1+5 1+3 5+3 9+3
"Hey Get Up And Dance" - 759535157
"Hit Me" - 555555555
"Ignition" - 7+9 9+7 7+9 9+7
"No Way" - 791379137913
"Oh God" - 9+3 9+3 9+3 9+3 9+3
"Ruler" - 3557553
"StopnGo" - 1133595
"Toasty" - 315797513
"Wierd Growl" - 9575153
"Xuxa" - 1151313
"Yeah I Know You Can" - 5315795