Shouldn't speculate, but:

Should Titan have liquid ethane/methane surface collections (lakes or even seas), my guess would be that the tidal forces generated by the gas giant planet would set up a tidal system that would be really something else (beyond my skills, though to come up with hard numbers, anybody have the kung-fu?). Perhaps a tsunami a day 'on the beach' of titan?

Suggestions of a possible 'tar' rain has been extrapolated from a methane rich atmosphere. I wonder if fluid colelctiuons on titan would be 'layered' like an old-school latte...

Or even pools of sludge with undulating pudding waves responding to the pull of saturn.

All speculation, but mighty cool stuff.
Imagine a furture manned mission flying the skies of titan with turbofan engines breathing methane and hydrogen and fuled by *oxygen*

D