I was thinking of finally covering myself in Nutella. However, I am a bit worried that it will clog the shower drain when I wash it of in the shower. Is there a risk of this happening?

The Nutella normally is creamed. How can I make it less creamy and more liquid to cover me and let it runned over my body? Any suggestions?

Just plug the drain and let the shower water soften and dilute the Nutella til you can drain it easily...

As with all messes- before showering physically remove as much mess as possible (wiping off with fingers etc)
Less mess down the drain the better (flush down toilet instead)

Or keep a trash bin with a bag in it beside the shower. (and then bonus, you can keep the trash bag for another round of funtime).

I use a squeegee with a rubber lip to scrape off thicker stuff before trying to shower. If you press down, you can get a lot off of it this way first.

While I agree with the toilet sentiment... I just flushed a bunch of cake batter, oatmeal and crushed up cakes down my tub drain... Just gotta make sure it's all diluted in water... Use hot water and make sure not to leave anything thick or clumpy....