OK, this ain't what most folks call a teaser, but...
If you like to fly fish and can talk a buddy into helping with a spinning rod, get him to throw a hookless plug (for example, to get a big blue on a fly). My pop and I used to do this when our meager skills couldn't get a big blue on a fly alone. Maybe the blues were moving, or spread out, or whatever. Just throw the hookless plug out, watch the blues go crazy over it as it approaches the fly fisherman, pull the plug out and put the fly down. Wham!
I've seen the equivalent of this in a lot of shows on OLN. Catch a sailfish on the fly - by having a teaser out there, and when the fish shows, pull the teaser, throw the fly. Best one I saw was blue runners (a form of jack?) - they swarmed the hookless plug like some demented cross between bluefish and small tuna, then the plug got replaced by the fly and boom!
Peter R