As the title says, if you can't do a job properly, then don't do it all! Here's a selection of fails that perfectly illustrate the point.
Mistakes at work are sometimes inevitable. However, some are so blatant that we wonder how the people responsible manage to hold down their job.
Here are 20 photos of astonishingly bad workmanship.
1. Was it really too much to expect?

© Bedirhan-026/Reddit
2. Hoping this is a running track, not a road

© XarathorXD/Reddit
3. Try untangling these

© Straight_Ballin11/Reddit
4. When you don't use an experienced plumber

© JonaPoka/Reddit
5. Top level security

© wansk**k/Reddit
6. Just to make sure your towel gets soaked

© APFrames/Reddit
7. This gives us panic attacks

© Yazzi1018/Reddit
8. When they're a few inches too short

© Yazzi1018/Reddit
9. Someone wasn't paying attention

© Nightduck8/Reddit
10. Factory fail

© chikinstik/Reddit
11. When the decorator leaves you a little present

© Maccasfor1/Reddit
12. State of the art

© songbird_subhi/Reddit
13. How to confuse the passengers

© itsjits/Reddit
14. Maybe the manufacturer had run out of "5"s

© PamEricus/Reddit
15. No kidding

© bo**ertaster/Reddit
16. At least there are paper towels

© schiz0idman_/Reddit
17. Just don't pick it up

© flyboyslc/Reddit
18. Time to reboot

© manga_fanatic/Reddit
19. Why?

© Cityboy216/Reddit
20. Enter at your own risk

© MattUWayne/Reddit