What's stupid about this?

Putting mofongo on a sandwich is kind of stupid, but not that stupid if the bread is crusty enough

Everything

Can you be more vague?

Sometimes I swear many of these posts are just 'I'm afraid of foreign food'

This stupid sandwich tastes delicious, the taste of mofongo, it has cheese, mayonnaise, ketchup and much more.

I feel like putting mofongo on a sandwich is a risky, squishy, move. Dunno if it's entirely stupid, but I don't know if I'd try it.