diff --git a/cmd/site/clacks.go b/cmd/site/clacks.go
new file mode 100644
index 0000000..3415d14
--- /dev/null
+++ b/cmd/site/clacks.go
@@ -0,0 +1,25 @@
+package main
+
+import (
+	"math/rand"
+	"net/http"
+	"time"
+)
+
+type ClackSet []string
+
+func (cs ClackSet) Name() string {
+	return "GNU " + cs[rand.Intn(len(cs))]
+}
+
+func (cs ClackSet) Middleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Add("X-Clacks-Overhead", cs.Name())
+
+		next.ServeHTTP(w, r)
+	})
+}
+
+func init() {
+	rand.Seed(time.Now().Unix())
+}
diff --git a/cmd/site/main.go b/cmd/site/main.go
index bb7b369..b5f7df9 100644
--- a/cmd/site/main.go
+++ b/cmd/site/main.go
@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"os"
 	"sort"
+	"strings"
 	"time"
 
 	"christine.website/cmd/site/internal/blog"
@@ -63,6 +64,7 @@ type Site struct {
 	Series      []string
 	SignalBoost []Person
 
+	clacks   ClackSet
 	patrons  []string
 	rssFeed  *feeds.Feed
 	jsonFeed *jsonfeed.Feed
@@ -73,6 +75,14 @@ type Site struct {
 
 var gitRev = os.Getenv("GIT_REV")
 
+func envOr(key, or string) string {
+	if result, ok := os.LookupEnv(key); ok {
+		return result
+	}
+
+	return or
+}
+
 func (s *Site) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	ctx := opname.With(r.Context(), "site.ServeHTTP")
 	ctx = ln.WithF(ctx, ln.F{
@@ -82,9 +92,8 @@ func (s *Site) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	if gitRev != "" {
 		w.Header().Add("X-Git-Rev", gitRev)
 	}
-	w.Header().Add("X-Clacks-Overhead", "GNU Ashlynn")
 
-	middleware.RequestID(s.xffmw.Handler(ex.HTTPLog(s.mux))).ServeHTTP(w, r)
+	s.clacks.Middleware(middleware.RequestID(s.xffmw.Handler(ex.HTTPLog(s.mux)))).ServeHTTP(w, r)
 }
 
 var arbDate = time.Date(2020, time.February, 29, 0, 0, 0, 0, time.UTC)
@@ -168,6 +177,7 @@ func Build() (*Site, error) {
 		mux:   http.NewServeMux(),
 		xffmw: xffmw,
 
+		clacks:      ClackSet(strings.Split(envOr("CLACK_SET", "Ashlynn"), ",")),
 		patrons:     pledges,
 		SignalBoost: people,
 	}
diff --git a/shell.nix b/shell.nix
index 6464c11..9453b2a 100644
--- a/shell.nix
+++ b/shell.nix
@@ -27,4 +27,6 @@ mkShell {
     # tools
     ispell
   ];
+
+  CLACK_SET = "Ashlynn,Terry Davis,Dennis Ritchie";
 }