I love peanut butter and sambal brandal (indonesian very spicy chili paste)
Peanutbutter and chocolate isn't that weird. The sell it in shops and call it 'snickers'
Only difference in Snickers the peanuts are whole so you still have to chew em, peanutbutter saves that trouble.
Cheese and jam, good stuff also.
Vegemite and Marmite : I think they're both disgusting. They're the perfect example of the sad state of Anglosaxon cuisine..