[MisterTea]

Yes, it's simple to do really. Just open the jar to make a few sandwiches then promptly forget about it in the back of the fridge for a year.

[CoastalCoder]

Leave the fridge unplugged and eventually the jelly will crawl up the wall on its own.

[charles_f]

Talking about English jelly, aka American jell-o, so not as easy as you say

[MisterTea]

You haven't forgotten about thing in the fridge, have you. It's scary looking back there ... forgotten. alone. unloved. Everything nails up to the wall back there. Check your fridge often.