Two ways:

1. As a receiver, you can emit the nostr event that means "zap received" without having necessarily received LN sats. You can create the invoice, use the preimage, and fake the contents of the zap note.

2. You can also use sockpuppet accounts to zap yourself. You could recycle lets say 100 sats over and over (send zap, receive zap, send sats back silently via LN, repeat). You can thus inflate the amount of zaps recived as high as you want, without having received that actual amount.