diff --git a/setup.cfg b/setup.cfg
index a7d8960..709d0b2 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -33,3 +33,4 @@ sopel.plugins =
     spicebot_command_lower = spicebot_command_lower
     spicebot_command_upper = spicebot_command_upper
     spicebot_command_echo = spicebot_command_echo
+    spicebot_command_spongemock = spicebot_command_spongemock
diff --git a/spicebot_command_spongemock/__init__.py b/spicebot_command_spongemock/__init__.py
new file mode 100644
index 0000000..fcbb333
--- /dev/null
+++ b/spicebot_command_spongemock/__init__.py
@@ -0,0 +1,49 @@
+
+import unicodedata
+import random
+
+from sopel import plugin
+
+from sopel_SpiceBot_Core_Prerun import prerun
+
+
+@prerun()
+@plugin.command('spongemock', 'smock')
+def upper(bot, trigger, comrun):
+    comrun.say(mock_case(comrun.command["trigger_str"]))
+
+
+def mock_case(text):
+    text = text.strip()
+
+    out = text[0].lower()
+    lower = True
+    repeat = 1
+
+    for char in text[1:]:
+        lo = char.lower()
+        up = char.upper()
+
+        if unicodedata.category(char) == 'Zs' or lo == up:
+            # whitespace shouldn't affect the case-repeat counting
+            # nor should characters whose case cannot be transformed
+            out += char
+            continue
+
+        if repeat == 2:
+            repeat = 1
+            lower = not lower
+            out += lo if lower else up
+        else:
+            which = random.choice([True, False])
+            if which:
+                out += lo
+            else:
+                out += up
+            if lower == which:
+                repeat += 1
+            else:
+                repeat = 1
+                lower = which
+
+    return out