1. jaunty.jaunty used in conjunction with other words like hat, path, walk but especially hat. "a jaunty little hat perched on his head".
4. luncheonette. why aren't there breakfastettes and dinnerettes? why luncheonette?
6. bobby pins. why are they named bobby pins? they're not really pins. and why bobby? why not betty? or boris? or possibly not even a "b" name at all?
7. devil's food cake. why food cake? isn't that redundant? and why do devils and angels have cakes named after them? how come there isn't an average joe food cake?
8. underpants. underpants is just funny. there is no dignity in the word underpants.
10. ostentatious. just using the word ostentatious is ostentatious.
how about some others?