diff --git a/src/cvars.cpp b/src/cvars.cpp
index fd93e79f8..82d0b12f1 100644
--- a/src/cvars.cpp
+++ b/src/cvars.cpp
@@ -892,6 +892,8 @@ consvar_t cv_palettenum = PlayerCheat("palettenum", "0").values(CV_Unsigned).onc
 extern CV_PossibleValue_t renderhitbox_cons_t[];
 consvar_t cv_renderhitbox = PlayerCheat("renderhitbox", "Off").values(renderhitbox_cons_t).description("Show hitboxes around objects");
 
+consvar_t cv_mentalsonic = PlayerCheat("mentalsonic", "Off").values(CV_OnOff).flags(CV_HIDDEN).description("Works out at the library");
+
 //
 // Dummy variables used solely in the menu system.
 // todo: add a way to use non-console variables in the menu
diff --git a/src/d_netcmd.h b/src/d_netcmd.h
index 21bdc53bd..b3b58de8b 100644
--- a/src/d_netcmd.h
+++ b/src/d_netcmd.h
@@ -98,6 +98,8 @@ extern consvar_t cv_kartdebugstart;
 extern consvar_t cv_debugrank;
 extern consvar_t cv_battletest;
 
+extern consvar_t cv_mentalsonic;
+
 typedef enum {
 	CV_CAPSULETEST_OFF,
 	CV_CAPSULETEST_MULTIPLAYER,
diff --git a/src/k_kart.c b/src/k_kart.c
index 7334567a9..b04135e98 100644
--- a/src/k_kart.c
+++ b/src/k_kart.c
@@ -5983,6 +5983,9 @@ void K_Squish(mobj_t *mo)
 
 	mo->spriteyscale =
 		FixedDiv(FRACUNIT, mo->spritexscale);
+
+	if (cv_mentalsonic.value && mo->type == MT_PLAYER)
+		mo->spriteyscale *= 2;
 }
 
 static mobj_t *K_FindLastTrailMobj(player_t *player)
diff --git a/src/m_cheat.c b/src/m_cheat.c
index f6bdda6bf..12b921d56 100644
--- a/src/m_cheat.c
+++ b/src/m_cheat.c
@@ -162,6 +162,21 @@ static UINT8 cheatf_savetheframes(void)
 	return 1;
 }
 
+static UINT8 cheatf_mentalsonic(void)
+{
+	cv_mentalsonic.value = !(cv_mentalsonic.value);
+	if (cv_mentalsonic.value)
+	{
+		S_StartSound(NULL, sfx_gshbb);
+	}
+	else
+	{
+		S_StartSound(NULL, sfx_kc46);
+	}
+
+	return 1;
+}
+
 #ifdef DEVELOP
 static UINT8 cheatf_devmode(void)
 {
@@ -235,6 +250,12 @@ static cheatseq_t cheat_savetheframes = {
 	(UINT8[]){ SCRAMBLE('s'), SCRAMBLE('a'), SCRAMBLE('v'), SCRAMBLE('e'), SCRAMBLE('t'), SCRAMBLE('h'), SCRAMBLE('e'), SCRAMBLE('f'), SCRAMBLE('r'), SCRAMBLE('a'), SCRAMBLE('m'), SCRAMBLE('e'), SCRAMBLE('s'), 0xff }
 };
 
+static cheatseq_t cheat_mentalsonic = {
+	NULL, cheatf_mentalsonic,
+	(UINT8[]){ SCRAMBLE('m'), SCRAMBLE('e'), SCRAMBLE('n'), SCRAMBLE('t'), SCRAMBLE('a'), SCRAMBLE('l'), SCRAMBLE(' '), SCRAMBLE('s'), SCRAMBLE('o'), SCRAMBLE('n'), SCRAMBLE('i'), SCRAMBLE('c'), 0xff }
+};
+
+
 #ifdef DEVELOP
 static cheatseq_t cheat_devmode = {
 	NULL, cheatf_devmode,
@@ -253,6 +274,7 @@ cheatseq_t *cheatseqlist[] =
 	&cheat_wrongwarp,
 	&cheat_savetheanimals,
 	&cheat_savetheframes,
+	&cheat_mentalsonic,
 #ifdef DEVELOP
 	&cheat_devmode,
 	&cheat_skipgoner,