This is making me think of The Mole People Must Pay

@Maulkin  
This is a science-proven fact. The Equestrian Guard actually uses this as a quick and dirty test to identify changelings in crowds, they speak out loud about the great time they had skydiving in a wind tunnel, and all but the most well-trained ling infiltrators react involuntarily by buzzing.
 
In fact, lings can even forget about food when in the Fun Machine. The EG discovered this fact when a well-behaved prisoner ling, for exemplary cooperation, was granted their request to visit the Wonderbolts’ training facility. The prisoner passed out due to exhaustion, but never made any attempt to exit the wind tunnel.

Sure.

Oooh, fun~!

Oh oh, a strange horse is talking to me from a underground cavern.  
Sorry mom, I can’t stop consuming mushrooms.

@HotKinkajou  

 
That’s just what a changeling would say. I’m onto you >=(

@Maulkin  
@2k.bb  
The bug would never lie about the Fun Machine.

Sure thing! Whatever you say ominous cave bug!

But it wasn’t fun. It wasn’t fun at all! D=