1

An ambush is laid somewhere

2

PC involvement is leaked to the enemy

3

The patron gives faulty aid somehow

4

Failing would be extremely unhealthy

5

The job IDs them as allies of a local faction

6

The macguffin is physically dangerous

7

An important location is hard to get into

8

Succeeding would be morally distasteful

9

A supposed ally is very unhelpful or stupid

10

The patron badly misunderstood the PCs

11

The job changes suddenly partway through

12

An unexpected troublemaker is involved

13

Critical gear will fail partway through

14

An unrelated accident complicates things

15

Payment comes in a hard-to-handle form

16

Someone is turning traitor on the patron

17

A critical element has suddenly moved

18

Payment is in avidly-pursued hot goods

19

The true goal is a subsidiary part of the job

20

No complications; it’s just as it seems to be