"Malma Ka Aina": McGarrett's method of interrogation? Leaving a man in a shark cage in the middle of the ocean without telling him the cage is for tourists and the sharks aren't man eaters. Also doubles as a Crowning Moment of Funny when McGarrett and Danny have a couple of beers and watch.
McGarrett: You ever get to double pretzel level? Danno: Triple Banana, bitch. McGarrett:(in awe) You lie.
"Nalowale": Danno is in a bar with McGarrett as part of their investigation for a kidnapped girl. They spot their victim — sorry — suspect, with another girl and Danno comments that if he were flirting with his daughter he'd knock out every single one of his teeth. When they see him slip something into the girl's drink, they move in, and Danno forces him to drink it!
Better still: back at the station, Steve wakes up their roofied suspect with an air horn.
"Hehe": The four members of 5-0 catch the split-up dope-juiced diamond robbers. They do it so AWESOME.
Having lost a suspect's car, McGarrett calls in a favour with an old acquaintance of his, a Navy intelligence officer. She provides the intel with a demand for some personal payment from him when she's in Hawaii on leave.
Chin-ho: You just had a top secret military spy satellite retasked and you got a date? McGarrett: I multitask.
Any time Kono gets her hands on a criminal. Like that time with the trash can lids for example.
Danno refusing to put up with Rachel's shit in "E Malama".
Danny:Stan does not get to make decisions regarding the safety of my daughter. So she can go to the Hilton with you or she can come on what is affectionately called a "ride along" with her father, okay?
The MMA fight in "Ka Hakaka Maikai" between Steve and Chuck Lidell.
McGarrett's commanding officer, Joe White, leading Five-0 on an unsanctioned rescue operation into North Korea to save Steve, and getting back up in the form of three members of Seal Team 9 to pay the team back for helping them on a prior case.
The theme song yet again. When the network unveiled a new, techno'd-up version of the theme for the re-imagining, the backlash was insane. So what did they do? Not only did they make a new one extremely close to the original except more aggressive, they brought in a lot of the original band members. That's right, fan backlash was so great it caused a reunion for the guys who play the theme song.That'show iconic this music is.
Catherine takes down the bad guy with a scissor kick attack in "Kahu".
You could hear a bit of 007 music in "Kahu" when Steve appears in a tux.
The captured Senate candidate in "Hana I WaʻIa". Held by Wo Fat, being forced to write a suicide note before he's killed, helplessly handcuffed to a chair...and left alone for a few minutes which gives him time to take apart the pen and pick the lock of the handcuffs with it, allowing him to escape.
"Hoʻopio" has a couple take a girl prisoner to collect on welfare benefits. Danny hits the abductor who tells him he can't do that because he's a cop. Steve has Danny give him his badge and lets his partner go to town on him while he walks out without another word.