There are a lot of flash games out there, here is a look at a few that are definitely worth your time.
In Radical Fishing you fish the "man's way", which means after you've caught as many fish as you can, you launch them all into the sky to be shot. Yes that's right in order to 'catch' the fish, you need to have blasted them to pieces. Each time you blast a fish you get money to buy new equipment to make your fishing experience better. If you are looking for some quick simple fun, it is really hard to go past this one.
You can check it out on Sugar Toast here.
Obey the Game is a collection of rapid mini games in the vein of something like Wario Ware. You play as an elephant trapped in a series of mini games and you must obey the orders you are given. That is unless it tells you to disobey, it seems simple enough but as the game gets faster and faster it becomes hard to resist your initial urge to either obey the orders or disregard them completely. While I think some people would love this game, it is the weakest of the three mentioned here. It is an Armor Game and it is available here.