I have an idea of what I might be able to do just wondering if anyone else may have any good ideas. I was thinking getting a small hand air pump filled with colored corn syrup winded through one of the tiers (of course the pump would be outside the back of the cake) But I don't think the plastic tube winding through the cake would be food safe so not quite sure what to do! Any suggestions would be awesome, TIA!

Here is a pic of a cake I saved to my faves. The person who made it said it gushed blood whenever he/she cut into it. Hope this helps! can't wait to see what you come up with.

http://cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1686133

Wow, that is really cool....maybe a severed head with blood coming out....thank you!

I like your pump idea. When I have used lights and such in cakes, I just ensure to wrap them in saran wrap. I would assume it would be the same for the pump. You could also use red colored piping gel for blood, but the jam that "Mrscunningham" used looked great! I just dont' know what polaner red raspberry flavour is and how it was mixed with the filling. I'd like to know!

Good idea with the saran wrap, I have never added anything to a cake besides buttercream and filling would I have to carve a hole first to place the tube through or would it collapse?

What kind of cake are you using? If you use a really dense cake (I use pound cake or WASC), then you should be able to just sort of push it through the cake. A nice, dense cake is very forgiving that way...It it tiered? If so, then you need to be conscious of the structure and support. Good luck!

There's food safe tubing. I'm thinking of the plastic tubes that run from the boxes of syrup to the soda machine. Maybe you could get a hold of something like that.

Is it going to ooze on to the cake? What will that do to the cake?

No problem.. Just for clarification, I did not make the fish cake, just saved it to my faves.

I will be using WASC, the soda syrup tubes is a great idea I'm sure i could get a hold of one. I knew I could count on CC for good ideas The guy who I am making it for is crazy fun and wants to squirt or spray people with it as they walk by. He throws an annual poker halloween party every year and everyone always suspects him to to something out of the box. I haven't really thought it all out yet so as far as it getting on the cake I'm not quite sure. I'm sure it will just add to the gore of it but I will probably put it on the bottom tier. Maybe I should just make that a dummy tier. Sorry thinking out loud! These are some great points and ideas so far if you have any others send them my way! I will post the pic when I am done!