1. Put it in a plastic bag and vigorously shake it
2. Stone it
3. Step on it
4. Sit on it
5. Overfeed it
6. Starve it
7. Decapitate it
8. Dissect it
9. Call pest control
10. Electrocute it
11. Spray insecticide
12. Drive on it
13. Freeze it
14. Microwave it
15. Bake it
16. Suffocate it
17. Feed it to another animal
18. Squash it between my fingers
19. Roast it
20. Burn it
21. Throw it inside the toilet bowl and flush it
22. Grate it like cheese
23. Drown it in sauces- chilli, mustard,or vinegar
24. Drown it in the washing machine
25. Drown it in alcohol and chemical
26. Chomp it
27. Use a hammer to hit it
28. Release it into the wild
29. Throw it from a high ground
30. Pluck its legs
31. Tie the cockroach
32. Pluck its wings
33. Dehydrate it
34. Arrow it
35. Sword it
36. Gun it
37. Put it in a cockroach stampede
38. Make a cockroach outfit
39. Stack box on it
40. Blindfold it
41. Feed it with Laxative
42. Put it in the hairdryer
43. Use a baseball racket to whack it
44. Bomb it
45. Use radiation to kill it
46. Burial it alive
47. Send it to North Pole
48. Release it into the dessert
49. Domesticate it poorly
50. Throw it into a pool of vomit
51. Make it as an ingredient for smoothie
52. Dice it
53. Vacuum it
54,. Put it in a garbage bin factory so the machine can churn and crash it
55. Use a Bug Zapper
56. Use a racket and continuously hit it
57. Make a time machine and sent it back to dinosaur time so it gets killed
58. Create a monster to eat it
59. Alternate and delete the cockroach
60. Put it into a shredder
61. Make it into a cockroach pancake
62. Make a bread out of its skin
63. Squash it under burgers
64. Use Venus Fly Trap
65. Dip it into wax
66. Poop and urinate on it
67. Use a flyswatter
68. Pour a bucket of cement on it
69. Put layers of butter on it
70. Use it as a Science experiment
71. Eat it
72. Pluck its mouth
73. Throw it into the swimming pool
74. Stuck it in glue
75. Gas it.
76. Sweep it away
77. Put it in a cockroach fight
78. Use a magnifying glass
79. Make it into a soup
80. Use it as a seasoning
81. Create a fake female cockroach to kill it
82. Cook it inside a porridge
83. Call the cleaner
84. Smack it with the newspaper
85. Squeeze lime or lemon on it
86. Make a cockroach cocktail
87. Put weights on it
88. Throw it inside a fish tank
89. Barbeque it
90. Make it burst
91. Squash it between doors
92. Feed it with poison
93. Use it as a toy for my pet
94. Put it inside my fan so the blades can slice it
95. Use a cloth and cover it
96. Send it to hell where Hitler can kill it
97. Drop i in volcano lava
98. Bake it into a pie
99. Fork it
100. Fry it
101. Steam it
Lastly, I was inspired by ideas from here :
http://gizmodo.com/5029066/10-hilarious-ways-to-kill-summertime-pests-with-gadgets