1961, a single unidentified flying object is spotted through out northern Europe, flying at incredible speed.
A pair of SAAB J29F Tunnan scrambles to identify the object but are attacked the very instant they make visual contact. The pilots barely manage to dodge the green slimy goo the UFO fires upon them.
Soon the UFO looses interest in this inferior opponent and nonchalantly speeds away at full speed, not paying these flying machines another thought. No thing made of man can compete with their superior technology, so why bother they thought.
Little did they know, that the J29F, one of the worlds fastest fighters had the capability to intercept and destroy them with the use of their quadruple 20mm cannons.
No UFO's have been spotted over Swedish territory ever since.

Planes and UFO are 3D models, clouds and smoke are painted in Photoshop.
The landscape is a photo.