Title says it all.
I personally think onion rings are high up there. I mean, rings. What can go wrong?
Also mashed potatoes. Mashed potatoes and gravy. Build up the taters and make an indent in the top. Poor gravy in it and you've got yourself your own personal volcano.
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I think I misinterpreted what you meant by play with. I was going to say cream or melted chocolate get it in all the right areas and lick it off.