The other reviewer "moosuch" is entirely mistaken. When I was a kid my family failed to find an easter egg just like this episode, and let me tell you it was a shockingly smelly thing. We only found it when the smell absolutely filled our guest bedroom. It was just behind a picture frame, but if it had been well-hidden I have no doubt it would've filled the whole house with that acrid sulfury smell.
...also this is a fun episode ... lol.
...also this is a fun episode ... lol.