Here is a Vignette from Half Life 2 of Gordon Freeman encountering a Barnacle. For those who don't know, Barnacles are stationery, ceiling dwellers who grab prey with their sticky tongue. In this vig, Gordon eyes an explosive barrel, which can be used to destroy Barnacles.
Note the radioactive lake. I named the lake "Lake Geiger" due to the fact that it sets off your geiger counter when you get to close.
Never played the game or seen someone play it but what happens next is gonna be good!!! Freeman pushing the Heavy barrel "come on, ya stupid heavy, piece of junk" He lifts it to the barnicle's tounge. the barnicle pulls the barrel up and tries to swallow it... Freeman: "Say by, by!!! Pulls out pistol, and backs away, points at barrel, "austa la vista bay-be!!!" pulls trigger... KA-BBBOOOMMM!!!! "Well, that's that". He then whistles as he walks away.