That's a good one especially when you realise that 'bitcoin' as a coin, doesn't even exist in a digital form. There's no string of ones and zeroes you could point out and say "there it is! there's my bitcoin". Only entries in a ledger...
At least you can point out the transaction details on blockchain and you can also point out your wallet the same as showing them how much money you have on paypal.
"Can you say, have BTC (virtual currency) if it can't be touched or smelled etc? And if it dumps in the future to zero....did it ever 'really' exist or was it just a futile virtual hope?
If it dumps in the future to zero, I guess you can say that it was just a futile virtual money instead. At least you can use it now to buy things online more conveniently without the need of revealing your credit card details to third party websites.