Mosquito Tornado: Photographer Ana Filipa Scarpa noticed this phenomenon while visiting Vila Franca de Xira, Portugal. Though it looked like a funnel cloud, she realized it was actually a swarm of moving insects.
She thought it was strange at first that the “twister” wasn’t moving toward her. As she got closer, some mosquitos actually entered her car. She estimated that the swarm extended about 1,000 feet high. (Source)