Once the idea is out there...
As suggested by travels_in_time:
13 Ways Jack Harkness Really Doesn't Want to Die
1. Nibbled by clams
2. Nibbled by cockroaches
3. Giant pitcher plant
4. Shot in the head by a trusted friend
5. While being forced to watch his friends tortured and killed
6. That garbage compacter in the Death Star
7. By a thousand papercuts, except it would take more like 10,000 and two weeks
8. Stoned by zealots on a planet with only acidic pea gravel
9. At the hands of a child soldier
10. After everyone else in the universe
11. Peeled like a banana
12. On television... fully clothed
13. Disembodied, in a big jar
13 Ways Jack Harkness Really Doesn't Want to Die
1. Nibbled by clams
2. Nibbled by cockroaches
3. Giant pitcher plant
4. Shot in the head by a trusted friend
5. While being forced to watch his friends tortured and killed
6. That garbage compacter in the Death Star
7. By a thousand papercuts, except it would take more like 10,000 and two weeks
8. Stoned by zealots on a planet with only acidic pea gravel
9. At the hands of a child soldier
10. After everyone else in the universe
11. Peeled like a banana
12. On television... fully clothed
13. Disembodied, in a big jar