Here's contrived for you:
In your hand, you have a Hunting Party, Tunnel, and any other card. On the top of your deck, you know (how... I don't know) you have one card followed by the remaining 7 (or 11) Tunnels. If you Discard the Tunnel now, your Hunting Party will draw the first card, and then reveal the first Tunnel and draw it. If you keep it in your hand, the Hunting Party will draw the first card and then reveal and discard the entire stack of Tunnels below it.