Time: All
Frequency: Every time
World name: Siren
Character name: Sophiane Fortanceste
NPC name: N/A
Monster name: N/A
Class/Level: Any
Party or solo: Any
In-game time: All
Area and coordinates: All
Steps:
1. Use mount Icon in hotbar
2. "Random Name mounts the "mount name"
3. Seems to take names of PCs/NPCs/Monsters near by

Happens on both of my Windows 7 computers.