How could I make a gag exploding birthday cake?

And if she does, aim it at him instead.

Well, maybe not if you don’t consider your eyes a part of your body. And let’s hope nobody is holding the cake cutting knife and is surprised, caught in the explosion, or has someone bump into them in the excitement.

Lighten up, Francis. We can’t go around in life obsessively worrying about pointy bits or exploding cakes. It takes the fun out of life.

I talked with their mother (my sister, God rest her soul) today. Her biggest worry is the mess it will make. She agreed that the other one will probably want an exploding cake next year. I’ll try to remember to post pictures.

This sounds like a really great way to ensure that girl will have trouble making friends for the rest of her life and possibly die without leaving behind heirs. Is your ultimate goal to have your genetic line outbreed your sibling’s?

Can you see dead people?

Yeeeahhhh, last year was last year. I’m sure they’ve loved their wacky uncle’s tricks their entire lives so far. But now she’s turning 12 and maybe that’s not true anymore. Are you real sure that she would really be ok with this. Not mum’s opinion who still think’s of her as her little girl, because this could go horribly wrong if you’re misjudging this.

Obviously you know the kid better than we do. However, when I was having my 11th birthday party with friends and family over, we were “fishing” over a sheet for candy and stuff. My mom put a pair of my underwear on the string. When I pulled it up, I cried all day long. Completely ruined the party, and turned what would otherwise have been a pretty fun memory into a traumatic recollection.

Please, for the love of gravy, do not do this.

Any plan that involvs combining the words gag and exploding is a bad plan.

I think you should examine other types of gag cakes. I am more than some here willing to believe your niece would enjoy a prank. But she will probably also put a lot of thought into her hair, makeup, and clothes for this party, and messing that up may hurt the day for her.

What about a meatloaf cake?

But if you really must, consider googling “science project volcano”. lots of great ideas there. If you just wrap the baking soda in something soft, like gelatin or cheap saran wrap, then you could leave it in the center of the acid, and let her cut into it. . .

Ok, I understand that you all are trying to help but my gosh are the girls you know that emotionally fragile? A little whipped cream in the face is a traumatic experience? (I do agree that the underwear prank is a step above but note that my prank involves no underwear.) Would it be a problem if I did this to boys?

Yes it could be a problem. For both girls and boys.
For me, when I was 12, it would have been a lot of fun. But by the time I was 12 and 4 months or so, your idea of a party would have been a terrible, terrible disaster.

What happened in those 4 months?–Well, I started attending boy/girl parties. (I had a lot of Jewish friends, and they had a lot of bar mitzvah parties.) Parties with dancing, with the lights dimmed,with girls wearing makeup, with rumors of kissing. No exploding cakes, no slime in the hair.
So the big question for you is: is your neice-- and ALL of her friends— 12 yrs old, or 12 plus 4 months?
Don’t rely on her mother’s word, and don’t rely on the way she acts when you she’s alone with you …You’re her fun-loving uncle; she knows it’s safe to act silly when you’re visiting and there’s nobody but family nearby.No fear of embarrassment.

Please— check your niece’s social circle.
When her friends, of both genders, are around, does she still act silly?And do they act silly along with her?

If so…HAVE FUN. And try not to poke out anybody’s eyes.

I think the best idea posted so far has been the wood block frosted to look like a cake trick. An excellent prank for a kid that age followed by a legitimate cake will still make you the silly, fun uncle and be much less dangerous than knives, explosions, and fire all together in the same situation.

You’ve never been a pre-teen girl, where the worst thing EVER is being embarassed in front of your friends. Trust me, when you’re that age, EVERYTHING is a big deal.

(And make sure there’s another cake in reserve)

I don’t know many boys who use blow dryers and carefully apply makeup for a birthday get-together. Of course there is a huge difference. Either way (boy or girl) makes you an asshole, but the fact that it’s a girl makes you a bigger asshole. Do you really have no recollection of being 12 years old, or were you a bully or what?

I haven’t responded until now because this is such a sick idea I have been waiting until I could find the exact words to express what a horrible, uncaring, and dense uncle, adult, and human being it makes you appear to be, but I have given up. Words fail me.

Whoa – I wouldn’t go THAT far. But obviously I do think he should make sure none of her friends from school are going to be there.

Deeg–we’re saying it’s a bad idea.

We’re all saying–it’s a bad idea.
When all Dopers agree that something is a bad idea, it is usually a very, very bad idea.

And your sister said she’s concerned about the mess anyways. If you want to play a joke, just go for the trick candles, or something like that.

Except we’re not *all *saying that. I’m not saying that, I’m just sitting here quietly rolling my eyes at the thought that a 12 year old girl who has loved messes and practical jokes in the past would suddenly become a wilting speshul snowflake overnight to the point of being traumatized by a little flying frosting without her mother or her favorite uncle noticing.

It is possible? Sure. Is it likely? I doubt it. I would have loved it, and suggested three other methods Uncle Deeg and I could try to make it even better on Mom’s birthday.

The only thing I do know for absolutely certain is that this girl’s mother and her uncle know her better than anyone else posting in this thread, including me.