Someone is willing to pay you $1,000,000 to work at McDonalds for the next 10 years, flipping burgers. You will get your wages on top of the million. You are not allowed to work on the side. Things to consider: not many will believe that you're being paid to work at a fast food joint and will probably assess you negatively for your decade-long tenure in the fast food industry. Also, consider how this will affect your resume and ability to be hired, post-McDonalds, since most of you will have spent your chief earning years wearing a paper hat.
Someone is willing to pay you $5,000,000 to be in 2girls1cup - the sequel. If you're male, obviously the title will change. However, the video will be fixed, where the cup of poo is exchanged for a cup of chocolate fudge when you have to eat it, and in the vomit scenes, you're simply gulping tapioca pudding and dropping it into each other's mouths. So, nothing that icky except having to kiss a girl. The downside is that everybody everwhere with internet access will see the video and you'll be regarded as an intensely disgusting, sick pervert. Friends and family included. You may tell them the truth behind the video, but would they believe you? Plus, you'll probably be recognized on the street at times
Someone is willing to pay you $1,000,000 to kill them. They're old, rich and want to die, but lack the courage to take their own life. If you accept the money, you have to shoot them on the side of the head, then place the pistol in their hand. You will be wearing gloves, and there will be a detailed suicide letter, written and signed by the man himself, so it should be an open and shut case. You just have to live with the memory of killing an old man and have that settle on your conscience. The money is paid out in cash and there will not be a paper trail leading back to you.