Help with animated sprays

[Jesus Lincoln]

I recently learned and saw that you can have little animated gifs ingame as sprays, i have seen in people's sigs a gif of, i think it was, a half life 2 thing humping a vivendi thing, could someone please link me to this and help me with making this into a spray

 

[`unreal]

i saw one and tried to make one with some tutorial thing but i cudnt get it workin *yet* - try and search on google, i found one of the first page lol