So ive caught this kid in my dorm using my shampoo 3 times this semester. I dont mind that hes using it, i just wish he would ask. Normally I wouldnt retaliate, but im going to be a graduating senior in 3 weeks, and im getting more and more eccentric. So what can i do to sabotage my own shampoo and get him with? This is the kind i have. Its kinda a light blue, white mix. Warning: Spoilers inside! I also have an old bottle of the 2 in1, which is a darker blue, but its clear. Warning: Spoilers inside! So the ideas ive gotten are: 1. Nair. I dont know if i want to bald him. But maybe. 2.Hair Dye. The only problem i have with this is the consistency and color have to match the original, because most people pour it into their hand, then apply to hair. 3. Ive heard of mixing in honey, but i dont know how effective that would be, i mean it might be but who knows. Does anyone have any ideas?