You don't lose until you sell.
...
...
In that case, you'll be interested in my 100% guaranteed Toilet Fund. Here's how it works:
1. Convert the money to be invested into cash.
2. Deposit it into the toilet.
3. Flush.
4. ? ? ?
5. Profit.
You will not lose a penny, as long as you remember not to sell.
well said. 
I've got to say, this place is almost like a parody of classical bad investment advice, and I honestly wonder if people here are trolling or not.
"You don't lose until you sell."
:facepalm:
Between that and the oft given advice of throwing good money in after bad "dollar cost average your way down"... there will be many here who are going to lose their shirts on bitcoin. Don't say I didn't warn you all.