Diachronicity, and variants

Diachronous Timechair

                   _
\   /            _/ |          \   /
 BIG    <-----  /___|  <-----   BIG
CRUNCH         O    o           BANG
/    \     S.HAWKING,ESQ.      /    \

{In a cloud of suns, stars and doves} HISTORY

----<--------------<--------------<----

     ,---<---.
     |       |    History is beyond the
     V       ^      straight line or
     |       |        the circle.
     `--->---'

Synchronous Timeshare — what happens when the same holiday is sold at the same time in an infinite number of universes by a travel agent based in whichever is the most profitable at the — er — time (?)

Nefarious Rhymeshare — similar deal involving poets

Heterogeneous Nightmare — induced by contemplation of the above

Diaphanous Nightwear — perhaps a veil should be drawn over this one (sorry!)