Pronunciation: i-'fe-m&r-&, -'fem-r&
Function: noun
Inflected Form(s): pluralephemeraalsoephem·er·ae /-m&r-E, -rE/; or ephemeras
Etymology: New Latin, from Greek ephEmera, neuter plural of ephEmeros
1 : something of no lasting significance -- usually used in plural
2 ephemera plural : collectibles (as posters, broadsides, and tickets) not intended to have lasting value
If so, check out this gallery, drawn from this book. If that doesn't change your mind, at least try to outdo those, so the rest of us can have a really good laugh behind your back.