diff --git a/shell.nix b/shell.nix
index 040e198..7d54288 100644
--- a/shell.nix
+++ b/shell.nix
@@ -11,15 +11,22 @@ pkgs.mkShell {
 	];
 
 	shellHook = ''
+		LAST=""
 		STIME=60
-		programs="cmatrix cbonsai nyancat fortuneCow"
+		programs="cmatrix cbonsai nyancat fortuneCow otherCow"
 	
 		trap 'stty sane; tput cnorm; clear' EXIT
 
 		while true; do
-			choice=$(echo "$programs" | tr ' ' '\n' | shuf -n 1)
+			while :; do
+				choice=$(echo "$programs" | tr ' ' '\n' | shuf -n 1)
+				[ "$choice" != "$LAST" ] && break
+			done
+			LAST="$choice"			
+
 			clear
-			tput sgr0	
+			tput sgr0
+	
 			case "$choice" in
 				cbonsai)
 					cbonsai -l -t 1 & pid=$!
@@ -37,6 +44,10 @@ pkgs.mkShell {
 					fortune | cowsay
 					sleep "$STIME" 
 					;;
+				otherCow)
+					fortune | cowsay --random
+					sleep "$STIME"
+					;;
 				esac
 				sleep 1
 			done