Cryptic Movie Quiz

[Twinkle_uk]

Not a newspaper quiz but hope you can help...
Movie Quiz at my work: Cryptic Horror Movie Titles

Clue:- If "M" was a weekday?
Clue:- Whatever floats your boat!

Any ideas? Thanks.

[Chinajan]

Second one: The Shallows?

[elliemay1]

1 What Happened to Monday?

[mallyh]

1 Friday the 13th

[mallyh]

m = 13th letter of the alphabet ^^^^

[elliemay1]

Well done, mallyh!

[mallyh]

thankyou :-) xx

[Twinkle_uk]

Oh yeah! Thanks. Great spot Mallya !! :)

[Twinkle_uk]

Whatever Floats Your Boat - could it be IT? With floating and a boat referenced?