What verb do these four names have in common?
Copenhagen
Danny
Roger
Tina
Clues:
If you get stumped on Tina, don't worry. It's a lesser known reference, and if you have a solution for the other three names, then Tina will probably fit in!
Danny and Roger are both first names of celebrities.
Danny is the pseudonym of a Lebanese-American actor.
Roger was in an English rock band.
Copenhagen is a brand name.