Canada Day 2003

No, the horizon is fine...they're just not shooting the fireworks straight up. Instead, they're being shot off at a slight angle. Also, the lights you see in the background are from boats in the lake in behind at various points which are not sitting on the horizon.

Unfortunately, a lot of latitude and detail was lost when I scanned this slide in; when viewed using a slide projector, the horizon is quite clear, and even the smoke clouds are quite prominent (here they can be just made out as a haze). Thanks for the comment!