Krazzykidds ways to know when a boss fight is about to happen
1. when the game hands you health items and ammo/weapons like candy
2. a long dramatic structure looms ahead of you i.e A Giant door, an elevator
3. when the game auto-saves right in front of a door
4. When your crippled and beaten character thinks they're gonna make it out of the base without being spotted.
5. you find yourself peeking into a large open cavern as you look through a doorway.