I'm looking for an old movie I saw a while ago (~2010) that felt as if it was an 80s style knock off comedy sci-fi. I don't remember much about it, or even in what context I saw it (I could have only seen the trailer) but one scene sticks out. The president has been kidnapped/abducted by the aliens and replaced by a clone. The aliens are explaining that they "cloned him using the building blocks of his DNA" where it cuts to a visual gag of actual coloured building blocks.
Several other moments I remember include a scene in an open area with lots of people/aliens where a background character is accosted by guards and killed using a 'dehydrator' or 'dehydration gun', as well as a scene in a busy space shuttle that looks like the inside of a 747, possibly featuring a crying baby and some floating vomit. I also seem to remember a homage to the Space Odyssey scene with a floating pen, but that could be from something else.