Some really great choices here.
- always makes me belly laugh, especially the "hello" guy and his "hello song".
Some Like it Hot
- what a script, what a cast.
That Touch of Mink
- Cary Grant trying to get Doris Day into bed and all the mishaps that ensue - what's not to like?
- fantastic songs and gags.
- the sequel is just as good, too.
What About Bob
- Bill Murray at his funniest.
Murder by Death -
Maybe the title isn't so inviting, but the situations are brilliant!
- one of the classics, surely.
Flight of the Navigator
- I've watched this so many times and it never gets old.
Even a really bad day would seem brighter after one of those.
EDIT: There are just so many, I keep adding!