You should always have a reason to make your call. Sometimes, we might have a compelling reason to bid (like a good suit), but not the values to bid. In some circumstances, that shouldn't stop us! If bidding (or making a lead-directional double) will help partner defend properly, we should get in there aggressively.
The key is to pay attention to the situation. Usually, we'll make these bids in situations where:
A) The opponents are unlikely to profitably double us; and
B) Partner isn't likely to do anything too catastrophic
I expect many players to pass throughout this quiz the first time. I also expect some players to start getting too aggressive in situations that turn out to be dangerous. You have to learn how to pick your spots, but finding this type of call will add a new dimension to your game (and keep you involved in auctions you may have slept through in the past).
None vul. You are South. You hold:
932 
KQJ98 
J982 
2
What will you do on this auction:
| West | North | East | South |
|---|---|---|---|
| 2 |
Pass | 2 |
? |
Pass
2
3
Other
None vul. You are South.
You hold:
943 43 AKJ109 753
What will your call be on this auction:
| West | North | East | South |
|---|---|---|---|
| 1 |
Pass | 2NT* | ? |
*Jacoby 2NT showing 4+spades and game forcing values
Pass
Dbl
3
No, really, pass
Other
Not vul against vul. You are South.
43 J98 7432 KQJ9
What is your call on the following auction:
| West | North | East | South |
|---|---|---|---|
| 2 |
Dbl | ? |
Pass
3
3
4
Other
None Vul. You are South. You hold:
KQJ9 43 9832 A98
| West | North | East | South |
|---|---|---|---|
| Pass | Pass | ? |
Pass
1
1
Other
Both Vul. You are South.
43 KQ32 A98 5432
| West | North | East | South |
|---|---|---|---|
| 1 |
Pass | 2NT* | Pass |
| 4NT | Pass | 5 |
? |
* Jacoby 2NT, GF 4-card raise
Pass
Dbl
I fell asleep after 2NT. Is it my turn to play yet?
None vul. You are South.
43 3 KQ10987 9872
| West | North | East | South |
|---|---|---|---|
| 1 |
Pass | 2 |
? |
Pass
3
4
Other
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